Fixed a bug in Mini-Language where a NPE could be thrown while using …

…Verbose logging: https://issues.apache.org/jira/browse/OFBIZ-5689.

git-svn-id: https://svn.apache.org/repos/asf/ofbiz/trunk@1612205 13f79535-47bb-0310-9956-ffa450edef68

framework/minilang/src/org/ofbiz/minilang/method/envops/Iterate.java

@@ -155,8 +155,10 @@ public boolean exec(MethodContext methodContext) throws MiniLangException {
                 }
             }
         } else {
-            if (Debug.verboseOn())
-                Debug.logVerbose("Cannot iterate over a " + objList.getClass().getName() + ", doing nothing: " + this, module);
+            if (Debug.verboseOn()) {
+                Debug.logVerbose("Cannot iterate over a " + objList == null ? "null object" : objList.getClass().getName()
+                        + ", doing nothing: " + this, module);
+            }
             return true;
         }
         entryFma.put(methodContext.getEnvMap(), oldEntryValue);