Degrade gracefully if description unavailable for some mountoption

Zhang Boyangrequested to merge
zhangboyang/partman-basicfilesystems:master into master

Some of btrfs mountoptions have no description. Currently they will not show up in mountoption chooser.

This commit fixes two problems:

  • mountoption without a description is skipped
  • one such mountoption will break all subsequent mountoptions

With this commit, those btrfs mountoptions will become choosable.

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