Fixed bug on unload of index

Author: lvca

core/src/main/java/com/orientechnologies/orient/core/type/tree/OMVRBTreePersistent.java

@@ -39,6 +39,7 @@
 import com.orientechnologies.orient.core.profiler.OJVMProfiler;
 import com.orientechnologies.orient.core.record.ORecord;
 import com.orientechnologies.orient.core.record.ORecordInternal;
+import com.orientechnologies.orient.core.storage.OStorageEmbedded;
 import com.orientechnologies.orient.core.type.tree.provider.OMVRBTreeProvider;
 
 /**
@@ -256,7 +257,7 @@ public void unload() {
       root = null;
 
       final ODatabaseRecord db = ODatabaseRecordThreadLocal.INSTANCE.getIfDefined();
-      if (db != null && !db.isClosed()) {
+      if (db != null && !db.isClosed() && db.getStorage() instanceof OStorageEmbedded) {
         // RELOAD IT
         try {
           load();