[mq] fix ``ev/null`` file entry appearing with removed files on unapplied patches (closes #89335)

1      def oldpath(self):
2          return self._oldpath
3 
4      def files(self):
5          """List of modified files"""
6 -        return tuple(path for path in (self._path, self._oldpath) if path)
7 +        return tuple(path for path in (self._path, self._oldpath)
8 +                     if path and not os.devnull.endswith(path))
9 +    # note endswith is used as the complete path have been cut
10 +    # (expecting ``a/`` at the beginning of path)
11 
12      def data(self):
13          """ return the patch hunks"""
14          return self._data
15      __str__ = data