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Fix panic due to inconsistent label cardinality when using queries.yaml.

When using queries.yaml, extra columns in the output would be detected as
unknown metrics (correctly) but the labels in the current mapping would not be
applied to the output.

This explains the rash of crashes due to inconsistent label cardinality. The
specific creation is when the name given to a column does not match the mapping
you intended, and so the metric shows up as unknown.

Closes #98

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