Merge branch 'tp/completion'

Merge branch 'tp/completion'

* tp/completion:
  Fixup: Add bare repository indicator for __git_ps1
  Add bare repository indicator for __git_ps1
  completion: More fixes to prevent unbound variable errors
  completion: Better __git_ps1 support when not in working directory
  completion: Use consistent if [...] convention, not "test"
  completion: For consistency, change "git rev-parse" to __gitdir calls