Better error logging

Author: tmpsantos

lib/src/flutterflow_main.dart

@@ -71,7 +71,8 @@ Future<void> appMain(List<String> args) async {
         break;
       default:
     }
-  } catch (_) {
+  } catch (e) {
+    stderr.write('Error running the app: $e\n');
     exit(1);
   }
 }

test/integration_test.dart

@@ -15,6 +15,9 @@ bool buildProject(String project) {
   var result = Process.runSync('flutter', ['build', 'web'],
       workingDirectory: p.normalize(project), runInShell: true);
 
+  print(result.stdout);
+  print(result.stderr);
+
   return result.exitCode == 0;
 }