Update BrokenPlugin to RF 2.9 error_details method
Update BrokenPlugin to RF 2.9 error_details method

In RF 2.9, Robot Framework's get_error_details method was updated to
return a tuple with message and traceback.

robotframework/RIDE,HelioGuilherme66/RIDE,HelioGuilherme66/RIDE,HelioGuilherme66/RIDE,HelioGuilherme66/RIDE,robotframework/RIDE,robotframework/RIDE,robotframework/RIDE