fails to check duplicate branches if leading/trailing spaces exist
Created originally on Bitbucket by steve-spencer (Steve Spencer)
We have a closed branch. We shouldn't be able to create a new branch with the same name - and the command line requires "-f" to authorise this. But workbench allows it without a prompt.
Admittedly pushing this to a central repo is typically denied due to multiple heads, but the "-f" option is there presumably because it's bad practice.