Omaha #3071 Fix one more possible NPE

Change-Id: I23c3f47d354a2a5ee4576a6040e2012b3b39dfe6

Former-commit-id: d772e2b49b [formerly d772e2b49b [formerly 855c5410fc4bf2e33f6dcd560f0c8441199ad0ad]]
Former-commit-id: fde392dcd1
Former-commit-id: d1f5016eb9

edexOsgi/com.raytheon.edex.plugin.gfe/src/com/raytheon/edex/plugin/gfe/server/database/D2DGridDatabase.java

@@ -813,6 +813,9 @@ public class D2DGridDatabase extends VGridDatabase {
         try {
             // Gets the metadata from the grib metadata database
             D2DParm parm = this.gfeParms.get(parmId);
+            if (parm == null) {
+                throw new GfeException("Unknown parmId: " + parmId);
+            }
             if (!GridPathProvider.STATIC_PARAMETERS.contains(parmId
                     .getParmName())) {
                 fcstHr = parm.getTimeRangeToFcstHr().get(timeRange);