HAWKULAR-963 : Detect change & render when chart data becomes undefined
HAWKULAR-963 : Detect change & render when chart data becomes undefined

tsegismont/hawkular-charts,mtho11/hawkular-charts,tsegismont/hawkular-charts,ammendonca/hawkular-charts,hawkular/hawkular-charts,mtho11/hawkular-charts,mtho11/hawkular-charts,hawkular/hawkular-charts,tsegismont/hawkular-charts,ammendonca/hawkular-charts,ammendonca/hawkular-charts,hawkular/hawkular-charts