aded3a5 [frontend] handle ActionInProgressException properly

1 file Authored by frostyx 4 years ago, Committed by msuchy 4 years ago,
    [frontend] handle ActionInProgressException properly
    
    This happens for example when trying to delete a build, that is
    currently in the `running` state.
    
    We want to specifically return such error message, instead of the
    genereral one ("Request wasn't successful, there is probably
    a bug in the API code.")