Ning Yao 89dfb91dd4 Fix empty metadata exception in Prometheus collector ...

Metadata defined in metrics.yml may be non-existent in data['metric']
from Prometheus results. Deal with the exception similarly to the
Gnocchi collector.

Change-Id: I02ee50793f3c46050250ca1c4094dd4ef0736ca6
Signed-off-by: Ning Yao <yaoning@unitedstack.com>
Story: 2008123
Task: 40845

2020-09-09 15:18:36 +02:00

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