loader: Ensure to search in a string when processing GitProtocolError
First argument of the exception is not always a string so force its text representation before searching in it.
Fixes SWH-LOADER-GIT-1HV
Staging instance, all changes can be removed at any time
First argument of the exception is not always a string so force its text representation before searching in it.
Fixes SWH-LOADER-GIT-1HV