Misc updates (#594)
Misc updates (#594)

* Misc updates

doUpdateCustomer - skip API call if user didn't update anything

getPhoto - handle uknkown user and user with no photo

doLabel, updateLabels - cleanup, make consistent

doGetGroupInfo - set settings in all cases to avoid having to use try/except

doPrintGroupMembers - message_attributes not used

* Give error when no arguments

GAM-team/GAM,GAM-team/GAM