Don't let repos without branches crash things.

Author: Hosch250

RetailCoder.VBE/UI/RubberduckUI.Designer.cs

@@ -1414,4 +1414,10 @@ All our stargazers, likers & followers, for the warm fuzzies
   <data name="SourceControl_UpdateSettingsTitle" xml:space="preserve">
     <value>Settings updated</value>
   </data>
+  <data name="SourceControl_NoBranchesMessage" xml:space="preserve">
+    <value>Repository does not contain any branches.</value>
+  </data>
+  <data name="SourceControl_NoBranchesTitle" xml:space="preserve">
+    <value>No branches found</value>
+  </data>
 </root>

RetailCoder.VBE/UI/RubberduckUI.resx

@@ -254,6 +254,13 @@ private void InitRepo()
 
         private void SetChildPresenterSourceControlProviders(ISourceControlProvider provider)
         {
+            if (Provider.CurrentBranch == null)
+            {
+                ViewModel_ErrorThrown(null,
+                    new ErrorEventArgs(RubberduckUI.SourceControl_NoBranchesTitle, RubberduckUI.SourceControl_NoBranchesMessage));
+                return;
+            }
+
             foreach (var tab in TabItems)
             {
                 tab.ViewModel.Provider = provider;

RetailCoder.VBE/UI/SourceControl/SourceControlViewViewModel.cs

@@ -81,7 +81,7 @@ public override IBranch CurrentBranch
         {
             get
             {
-                return Branches.First(b => !b.IsRemote && b.IsCurrentHead);
+                return Branches.FirstOrDefault(b => !b.IsRemote && b.IsCurrentHead);
             }
         }