remove unnecessary check.

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

@@ -83,9 +83,7 @@ public class CollectionPath {
     }
 
     public synchronized CollectionDetails createIfNotExist(MFSession session, boolean createParents) throws Throwable {
-        if (_exists == null) {
-            resolveCollectionDetails(session);
-        }
+        resolveCollectionDetails(session);
         if (!_exists) {
             CollectionType type = CollectionType.collectionTypeFor(_path, session);
             if (type == CollectionType.asset) {