git_sort: Fix error message for patches missing Git-commit.
    
    To reject unsortable patches from out-of-tree section patches without a
    Git-commit that don't have Patch-mainline Submitted or Not yet are
    rejected with an error message saying that this tag is not supported.
    
    However, this is the case also for patches that have Patch-mainline
    Queued or version which are missing Git-commit.
    
    Add a separate error message for this case.
    
    Fixes: eaff9bcc7268 ("git_sort/lib: Only allow patches intended for mainline.")
    Signed-off-by: Michal Suchanek <msuchanek@suse.de>