RFR: 1427: Remove unnecessary warning log message

[Erik Joelsson]

The PR bot currently logs a warning about not finding a CSR for every PR. This seems unnecessary.

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Commit messages:
 - SKARA-1427

Changes: https://git.openjdk.java.net/skara/pull/1316/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1316&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1427
  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/1316.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1316/head:pull/1316

PR: https://git.openjdk.java.net/skara/pull/1316