RFR: JDK-8288545: Missing space in error message

[Jonathan Gibbons]

Please review a minor update to fix the content of an error message.

As reported in JBS, the problem was partly that there was a missing space to separate two items, but also, the second item should not have been there anyway.

The fix here, for 19, is to suppress the second item.    Fixing the missing space will be part of a follow-up cleanup in mainline, that is too big to include here.

Note: there is no attempt in this fix to address whether the message should be generated at all.

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Commit messages:
 - JDK-8288545: Missing space in error message

Changes: https://git.openjdk.org/jdk19/pull/30/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk19&pr=30&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288545
  Stats: 80 lines in 2 files changed: 76 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk19/pull/30.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/30/head:pull/30

PR: https://git.openjdk.org/jdk19/pull/30