operator<< on a DiagnosticBuilder should *always* output exactly one thing.
Null template arguments are bad, but they're better than crashing with an
argument mismatch.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@110312 91177308-0d34-0410-b5e6-96231b3b80d8
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