Don't display "-" in error message when label is null.
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Key: TRINIDAD-1278
URL: https://issues.apache.org/jira/browse/TRINIDAD-1278
Project: MyFaces Trinidad
Issue Type: Bug
Affects Versions: 1.2.9-core
Reporter: Cale Scholl
Priority: Minor
Attachments: trunk12_noDash.patch
When the label is null, the error message printed at the top of the screen will
be something like "- Invalid data". The "-" looks unsightly without any text
preceding it, so we shouldn't render it.
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