Exception getting metric if group is empty

[jvalkeal]

Tracking group metrics with no members throws exception. Need to check nulls...

2012-01-10 17:10:39,127 WARN [tomcat-http--1] [org.hyperic.hq.hqu.PluginWrapper@156] Error handling request from /media/uhome/hyperic/server-4.6-EE/hq-engine/hq-server/webapps/ROOT/hqu/wmvisualizer
java.lang.NullPointerException
at org.codehaus.groovy.runtime.dgmimpl.NumberNumberDiv$DoubleInteger.call(NumberNumberDiv.java:247)
at MetricstoreController.getMetrics(MetricstoreController:99)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)