fixed permission error when trying to check parent path when the parent is...

fixed permission error when trying to check parent path when the parent is /projects collection asset.

src/main/java/unimelb/mf/client/util/collection/CollectionPath.java

@@ -128,7 +128,9 @@ public class CollectionPath {
     }
 
     public synchronized CollectionDetails createIfNotExist(MFSession session, boolean createParents) throws Throwable {
-        CollectionUtils.createCollection(_path, createParents, true, session);
+    	if(!exists(session)) {
+            CollectionUtils.createCollection(_path, createParents, true, session);        	
+    	}
         return resolve(session, true);
     }
 }