Craig Bryant 237c752e6a Fix problem where dimensions were null
This caused issues for the MetricDefinitionAndTenantIdMatcher when
it was comparing dimensions. Changed it to replace null with an
empty set since that is what the rest of the code is expecting

Change-Id: I3dbec749f29604ef49d89d4a8ec1f6d882305957
2015-08-04 08:53:22 -06:00
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