Fix incorrect handling of omitted display name (and description) revealed by gRPC #3178
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Resolves #3177
In some of the metrics generalization done for 2.3.0 (to support MP metrics and Micrometer), some changes incorrectly assigned the
displayNameanddescriptionfor a metric's metadata even if those were omitted from a metrics annotation. They should be left unassigned in that case.The changes here correct that in the metrics code and in some similar code in gRPC metrics.