Don't abort if 'insert into Files' gives an IntegrityError.
Don't abort if 'insert into Files' gives an IntegrityError.

It can happen occasionally if some other parallel redo adds the same file at
the same time.

rowhit/redo,apenwarr/redo,pombredanne/redo,apenwarr/redo,apenwarr/redo,rowhit/redo,dinkelk/redo-python,pombredanne/redo,apenwarr/redo,pombredanne/redo,rowhit/redo,pombredanne/redo,dinkelk/redo-python,rowhit/redo,dinkelk/redo-python,dinkelk/redo-python