* Added tests for wanted behavious in MetricsStatEditor
* Removed wrong import
* Updated MetricStatEditor to add new behaviour
* Updated tests to use react-select-event
* removed unused export
* Adding check for empty string in select value and force null
* clean up
* added check to avoid call to getMetric if there is no metricName selected
* removed todo
* removed empty lines
* Moved external import to top
* Refactored tests to copy props rather than overriding them
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