fixed NPE when influencedVariable has no name

edu.kit.ipd.descartes.mm.applicationlevel.edit/src/edu/kit/ipd/descartes/mm/applicationlevel/parameterdependencies/provider/InfluencedVariableReferenceItemProvider.java

@@ -123,13 +123,16 @@ public class InfluencedVariableReferenceItemProvider
 	public String getText(Object object) {
 		InfluencedVariableReference ivr = (InfluencedVariableReference) object;
 		InfluencableModelVariable influencedVariable = ivr.getInfluencedVariable();
+		String name = "";
 		
-		if (influencedVariable != null)	
+		if (influencedVariable != null)	 {
 			listenerComponent.tryToUpdateListeners(ivr, influencedVariable);
+			name = influencedVariable.getName();
+		}
 		
 		
 		return getString("_UI_InfluencedVariableReference_type") 
-				+ " " + influencedVariable.getName();
+				+ " " + name;
 	}