More informative error message when trying to retrieve a single head, but there are multiple.

#7 Merged at 3b86868
Repository
obeattie
Branch
master
Repository
zzzeek
Branch
master
Author
  1. Oliver Beattie
Reviewers
Description

When running alembic upgrade head, if there are divergences in the script directory due to branching, the current error message is uninformative and offers little guidance as to what to do next. To a newbie (me), this was confusing.

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