GitHostSetup: Abort on exception

Otherwise we land up accessing the 'cloneUrl' of a null object and get
another exception.

lib/screens/githostsetup_autoconfigure.dart

@@ -91,6 +91,7 @@ class GitHostSetupAutoConfigureState extends State<GitHostSetupAutoConfigure> {
           setState(() {
             errorMessage = widget.gitHostType.toString() + ": " + e.toString();
           });
+          return;
         }
         widget.onDone(repo.cloneUrl);
       });

pubspec.yaml

@@ -1,6 +1,6 @@
 name: journal
 description: A Journaling App Built on top of Git
-version: 1.1.7+10
+version: 1.1.8+10
 
 dependencies:
   flutter: