If we don't have a bin/web folder nor a lib/main.dart file, check example folder to launch
If we don't have a bin/web folder nor a lib/main.dart file, check example folder to launch

Fixes #1927.

Dart-Code/Dart-Code,Dart-Code/Dart-Code,Dart-Code/Dart-Code,Dart-Code/Dart-Code,Dart-Code/Dart-Code