Initial fix for metrics with no data missing columns.
Changed new method name and updated portlet.jelly to use it.
JENKINS-22412 Update values in portlet to show N/A instead of 0 when no data is present.
JENKINS 22412 Added N/A to totals when no data is present.
JENKINS-22412 Added test for new getMetricsWithEmpty() method.
JENKINS-22412 Removed extra lines in coverage-no-data.xml .
Merge pull request #27 from Tamini/develop

[JENKINS-22412] : Portlet view has missing and wrongly aligned columns when a metric has no data.