make sure we warn the user if there is no app folder instead of crash
make sure we warn the user if there is no app folder instead of crash

tsvetie/nativescript-cli,NativeScript/nativescript-cli,NathanaelA/nativescript-cli,tsvetie/nativescript-cli,tsvetie/nativescript-cli,NathanaelA/nativescript-cli,tsvetie/nativescript-cli,NativeScript/nativescript-cli,NathanaelA/nativescript-cli,tsvetie/nativescript-cli,NativeScript/nativescript-cli,NativeScript/nativescript-cli,NathanaelA/nativescript-cli