RFR: Treat bad whitespace in commit message gracefully

[Robin Westberg]

The check "message" should handle the error gracefully instead of throwing. Also trim individual lines in multi-line
summaries to help avoid this problem in the first place.

Best regards,
Robin

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Commit messages:
 - Treat bad whitespace in commit message gracefully

Changes: https://git.openjdk.java.net/skara/pull/814/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=814&range=00
  Stats: 6 lines in 2 files changed: 3 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/skara/pull/814.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/814/head:pull/814

PR: https://git.openjdk.java.net/skara/pull/814