fix: update the error message shown when the app is not migrated and the message shown at the end of migrate command
fix: update the error message shown when the app is not migrated and the message shown at the end of migrate command

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