RFR: Turn an exception into a log message to allow further issues to be processed

[Robin Westberg]

It is possible for an issue to no longer be properly resolved by the time tagging occurs - in this case we can just skip it to allow the rest of the issues in the corresponding tag to get updated properly.

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Commit messages:
 - Turn an exception into a log message to allow further issues to be processed

Changes: https://git.openjdk.java.net/skara/pull/1080/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1080&range=00
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/1080.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1080/head:pull/1080

PR: https://git.openjdk.java.net/skara/pull/1080