Fix add_group so that group_name defaults to string
Fix add_group so that group_name defaults to string

shaon/eutester,nephomaniac/eutester,sjones4/eutester,nagyistoce/eutester,tbeckham/eutester,nagyistoce/eutester,nephomaniac/eutester,shaon/eutester,nagyistoce/eutester,nagyistoce/eutester,tbeckham/eutester,nephomaniac/eutester,nephomaniac/nephoria,nephomaniac/nephoria,tbeckham/eutester,shaon/eutester,sjones4/eutester,sjones4/eutester,shaon/eutester,sjones4/eutester,tbeckham/eutester