Skip processing empty metrics slice in Stackdriver exporter #1494
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Description:
Fixing a minor bug - skip empty metrics slice instead of returning an error.
The OpenCensus exporter code currently returns an error when it encounters empty metrics slice: https:/census-ecosystem/opencensus-go-exporter-stackdriver/blob/59d068f8d8ff5b653916aa30cdc4e13c7f15d56e/metrics_proto.go#L53-L55
The easiest way to mitigate this issue is by adding a check to skip processing of empty slice.