Can't edit or remove workzone with undefined branch

[Aaron Pollock]

I'm guessing it's because the branch was modified or deleted, but in Workzone once a branch is listed as "undefined", the edit and delete buttons do nothing, so it remains in the list and we cannot get rid of it.

[Ulrich Kuhnhardt [IzymesDev]]

Hi Aaron,

please review the solution in https://bitbucket.org/izymesdev/workzone/issue/55/cannot-delete-reviewers-after-null-name.

Let me know how you go.