RFR: Avoid quoting an empty review body

[Robin Westberg]

Hi all,

Please review this minor change that avoids quoting an empty review body when replying to a review. 

Best regards,
Robin

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Commits:
 - 51090e3a: Avoid quoting an empty review body

Changes: https://git.openjdk.java.net/skara/pull/366/files
 Webrev: https://webrevs.openjdk.java.net/skara/366/webrev.00
  Stats: 58 lines in 2 files changed: 56 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/366.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/366/head:pull/366

PR: https://git.openjdk.java.net/skara/pull/366