Returns true if a BreakdownSet contains no entries. If there are Breakdowns in the list but they do not contain values this function will return true. This is a useful function when developing new KPI formula as it can be used for simple debug logging.  

var issues = metrics.get('critical issues').getLatest(); 

if (issues.breakdown().isNull()){

    console.log('No breakdown values for critical issues on: %s',
                now);

}
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