Auto description generation broken in certain cases

[Brian Pescatore]

Using the syntax:

"stash pull-request feature/foo origin/release/1.0"

This will cause a git error to pop out when getting a log delta because it is trying to get a delta from "release/1.0..feature/foo" rather than "origin/release/1.0..feature/foo" -- the pull request still works, but the description generation doesn't populate.

If you happen to have a local branch named "release/1.0" then the description will be generated but it may or may not be the correct logs depending on the state of that local branch.