RFR: 434: Adding a contributor without a full name gives a NPE

[Robin Westberg]

Hi all,

Please review this change that ensures that an additional contributor is properly specified.

Best regards,
Robin

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Commit messages:
 - Check that full name is present

Changes: https://git.openjdk.java.net/skara/pull/683/files
 Webrev: https://webrevs.openjdk.java.net/skara/683/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-434
  Stats: 12 lines in 2 files changed: 10 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/683.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/683/head:pull/683

PR: https://git.openjdk.java.net/skara/pull/683