Adds exception handling of uri creation in profile background image u…

…pdate (#11542)

<!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? -->
## Summary of the Pull Request
Moves baskgroung image update releated code into separate function and adds uri path construction exeption handling.
<!-- Other than the issue solved, is this relevant to any other issues/existing PRs? --> 
## References

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## PR Checklist
* [x] Closes #11361
* [x] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
* [ ] Tests added/passed
* [ ] Documentation updated. If checked, please file a pull request on [our docs repo](https://github.com/MicrosoftDocs/terminal) and link it here: #xxx
* [ ] Schema updated.
* [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

<!-- Provide a more detailed description of the PR, other things fixed or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed
Tried to put garbage as a path. Terminal didn't crashed.

src/cascadia/TerminalControl/TermControl.cpp

@@ -297,37 +297,7 @@ namespace winrt::Microsoft::Terminal::Control::implementation
             return;
         }
 
-        if (!newAppearance.BackgroundImage().empty())
-        {
-            Windows::Foundation::Uri imageUri{ newAppearance.BackgroundImage() };
-
-            // Check if the image brush is already pointing to the image
-            // in the modified settings; if it isn't (or isn't there),
-            // set a new image source for the brush
-            auto imageSource = BackgroundImage().Source().try_as<Media::Imaging::BitmapImage>();
-
-            if (imageSource == nullptr ||
-                imageSource.UriSource() == nullptr ||
-                imageSource.UriSource().RawUri() != imageUri.RawUri())
-            {
-                // Note that BitmapImage handles the image load asynchronously,
-                // which is especially important since the image
-                // may well be both large and somewhere out on the
-                // internet.
-                Media::Imaging::BitmapImage image(imageUri);
-                BackgroundImage().Source(image);
-            }
-
-            // Apply stretch, opacity and alignment settings
-            BackgroundImage().Stretch(newAppearance.BackgroundImageStretchMode());
-            BackgroundImage().Opacity(newAppearance.BackgroundImageOpacity());
-            BackgroundImage().HorizontalAlignment(newAppearance.BackgroundImageHorizontalAlignment());
-            BackgroundImage().VerticalAlignment(newAppearance.BackgroundImageVerticalAlignment());
-        }
-        else
-        {
-            BackgroundImage().Source(nullptr);
-        }
+        _SetBackgroundImage(newAppearance);
 
         // Update our control settings
         const auto bg = newAppearance.DefaultBackground();
@@ -412,6 +382,57 @@ namespace winrt::Microsoft::Terminal::Control::implementation
         }
     }
 
+    // Method Description:
+    // - Sets background image and applies its settings (stretch, opacity and alignment)
+    // - Checks path validity
+    // Arguments:
+    // - newAppearance
+    // Return Value:
+    // - <none>
+    void TermControl::_SetBackgroundImage(const IControlAppearance& newAppearance)
+    {
+        if (newAppearance.BackgroundImage().empty())
+        {
+            BackgroundImage().Source(nullptr);
+            return;
+        }
+
+        Windows::Foundation::Uri imageUri{ nullptr };
+        try
+        {
+            imageUri = Windows::Foundation::Uri{ newAppearance.BackgroundImage() };
+        }
+        catch (...)
+        {
+            LOG_CAUGHT_EXCEPTION();
+            BackgroundImage().Source(nullptr);
+            return;
+        }
+
+        // Check if the image brush is already pointing to the image
+        // in the modified settings; if it isn't (or isn't there),
+        // set a new image source for the brush
+        auto imageSource = BackgroundImage().Source().try_as<Media::Imaging::BitmapImage>();
+
+        if (imageSource == nullptr ||
+            imageSource.UriSource() == nullptr ||
+            imageSource.UriSource().RawUri() != imageUri.RawUri())
+        {
+            // Note that BitmapImage handles the image load asynchronously,
+            // which is especially important since the image
+            // may well be both large and somewhere out on the
+            // internet.
+            Media::Imaging::BitmapImage image(imageUri);
+            BackgroundImage().Source(image);
+        }
+
+        // Apply stretch, opacity and alignment settings
+        BackgroundImage().Stretch(newAppearance.BackgroundImageStretchMode());
+        BackgroundImage().Opacity(newAppearance.BackgroundImageOpacity());
+        BackgroundImage().HorizontalAlignment(newAppearance.BackgroundImageHorizontalAlignment());
+        BackgroundImage().VerticalAlignment(newAppearance.BackgroundImageVerticalAlignment());
+    }
+
     // Method Description:
     // - Set up each layer's brush used to display the control's background.
     // - Respects the settings for acrylic, background image and opacity from

src/cascadia/TerminalControl/TermControl.h

@@ -202,6 +202,7 @@ namespace winrt::Microsoft::Terminal::Control::implementation
         void _UpdateSettingsFromUIThread(IControlSettings newSettings);
         void _UpdateAppearanceFromUIThread(IControlAppearance newAppearance);
         void _ApplyUISettings(const IControlSettings&);
+        void _SetBackgroundImage(const IControlAppearance& newAppearance);
 
         void _InitializeBackgroundBrush();
         void _BackgroundColorChangedHandler(const IInspectable& sender, const IInspectable& args);