Use getattr() instead of hasattr() plus .member

pylint 2.7.2 from Debian 11 (bullseye) complains:

```
************* Module apport.crashdb_impl.launchpad
apport/crashdb_impl/launchpad.py:179:22: E1101: Instance of 'Exception' has no 'content' member (no-member)
************* Module apport.ui
apport/ui.py:590:23: E1101: Instance of 'ValueError' has no 'errno' member (no-member)
```

Use `getattr()` directly instead of checking with `hasattr()` before
accessing the member.

Signed-off-by: Benjamin Drung <bdrung@ubuntu.com>

apport/crashdb_impl/launchpad.py

@@ -175,14 +175,10 @@ def launchpad(self):
                 version="1.0",
             )
         except Exception as error:
-            if hasattr(error, "content"):
-                msg = error.content
-            else:
-                msg = str(error)
             apport.error(
                 "connecting to Launchpad failed: %s\n"
                 'You can reset the credentials by removing the file "%s"',
-                msg,
+                getattr(error, "content", str(error)),
                 self.auth,
             )
             sys.exit(99)  # transient error

apport/ui.py

@@ -584,11 +584,10 @@ def run_report_bug(self, symptom_script=None):
                 )
                 return False
             except (ValueError, OSError) as error:
-                if hasattr(error, "errno"):
+                if getattr(error, "errno", None) == errno.ENOENT:
                     # silently ignore nonexisting PIDs; the user must not
                     # close the application prematurely
-                    if error.errno == errno.ENOENT:
-                        return False
+                    return False
                 self.ui_error_message(
                     _("Invalid PID"),
                     _(