am 16a56b8c: Fix NPE in layoutopt when trying to open non-XML files.

Merge commit '16a56b8ccd39c812c8c7b86bd83ec9c492d19de9' into eclair-mr2

* commit '16a56b8ccd39c812c8c7b86bd83ec9c492d19de9':
  Fix NPE in layoutopt when trying to open non-XML files.