pre-push hook fails when pushing tags #480
Description
When I run git push --tags git@heroku.com:repo.git the pre-push hook fails with the following exception:
Running pre-push hooks
Check for illegal pushes to protected branches....[ProtectedBranches] FAILED
Hook raised unexpected error
no implicit conversion of nil into String
/Users/hasghari/.rvm/gems/ruby-2.2.5@ue/gems/overcommit-0.38.0/lib/overcommit/hook/pre_push/protected_branches.rb:25:in `fnmatch'
/Users/hasghari/.rvm/gems/ruby-2.2.5@ue/gems/overcommit-0.38.0/lib/overcommit/hook/pre_push/protected_branches.rb:25:in `block in protected?'
/Users/hasghari/.rvm/gems/ruby-2.2.5@ue/gems/overcommit-0.38.0/lib/overcommit/hook/pre_push/protected_branches.rb:24:in `any?'
/Users/hasghari/.rvm/gems/ruby-2.2.5@ue/gems/overcommit-0.38.0/lib/overcommit/hook/pre_push/protected_branches.rb:24:in `protected?'
/Users/hasghari/.rvm/gems/ruby-2.2.5@ue/gems/overcommit-0.38.0/lib/overcommit/hook/pre_push/protected_branches.rb:18:in `block in illegal_pushes'
/Users/hasghari/.rvm/gems/ruby-2.2.5@ue/gems/overcommit-0.38.0/lib/overcommit/hook/pre_push/protected_branches.rb:17:in `select'
/Users/hasghari/.rvm/gems/ruby-2.2.5@ue/gems/overcommit-0.38.0/lib/overcommit/hook/pre_push/protected_branches.rb:17:in `illegal_pushes'
/Users/hasghari/.rvm/gems/ruby-2.2.5@ue/gems/overcommit-0.38.0/lib/overcommit/hook/pre_push/protected_branches.rb:5:in `run'
/Users/hasghari/.rvm/gems/ruby-2.2.5@ue/gems/overcommit-0.38.0/lib/overcommit/hook/base.rb:45:in `block in run_and_transform'
/Users/hasghari/.rvm/gems/ruby-2.2.5@ue/gems/overcommit-0.38.0/lib/overcommit/utils.rb:260:in `with_environment'
/Users/hasghari/.rvm/gems/ruby-2.2.5@ue/gems/overcommit-0.38.0/lib/overcommit/hook/base.rb:45:in `run_and_transform'
/Users/hasghari/.rvm/gems/ruby-2.2.5@ue/gems/overcommit-0.38.0/lib/overcommit/hook_runner.rb:152:in `run_hook'
/Users/hasghari/.rvm/gems/ruby-2.2.5@ue/gems/overcommit-0.38.0/lib/overcommit/hook_runner.rb:88:in `block in consume'
/Users/hasghari/.rvm/gems/ruby-2.2.5@ue/gems/overcommit-0.38.0/lib/overcommit/hook_runner.rb:85:in `loop'
/Users/hasghari/.rvm/gems/ruby-2.2.5@ue/gems/overcommit-0.38.0/lib/overcommit/hook_runner.rb:85:in `consume'
✗ One or more pre-push hooks failed