RFR: 981: Jira issue parser bails on space after URL

[Robin Westberg]

If a comment looks like a remote link but contains an invalid URI, just ignore it. The comments posted by Skara cannot contain such links.

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Commit messages:
 - Handle invalid URIs gracefully

Changes: https://git.openjdk.java.net/skara/pull/1133/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1133&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-981
  Stats: 21 lines in 1 file changed: 8 ins; 1 del; 12 mod
  Patch: https://git.openjdk.java.net/skara/pull/1133.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1133/head:pull/1133

PR: https://git.openjdk.java.net/skara/pull/1133