Check branch for environment before connecting to remote servers

[PhilTaken]

When testing local changes on a separate branch via ./batou deploy -P with the git-bundle method set and some branch restrictions for the environment (e.g. branch = staging for a staging environment), batou fails with an unclear error message. Could the branch be checked locally, before connecting to remote servers, and output a useful error message?

[stevleibelt]

@PhilTaken would you be so nice and scribble the steps you've done in your issue to ease up reproducing your problem?

Please also include the error messages as well es your expectations. Please double check to remove all private information.

Best regards, Stev