Fixes the EntityRepository for Content and Media, so trees load correctly.

Fixes U4-2306
Fixes loading of MNTP.
FolderBrowser is now able to show multiple images on a single media item.
FolderBrowser only shows images and not containers.

src/umbraco.editorControls/MultiNodeTreePicker/FilteredContentTree.cs

@@ -36,6 +36,14 @@ namespace umbraco.editorControls.MultiNodeTreePicker
         /// </summary>
         private int? m_DeterminedStartNodeId = null;
 
+        protected override bool LoadMinimalDocument
+        {
+            get
+            {
+                return false;
+            }
+        }
+
         /// <summary>
         /// Returns the Document object of the starting node for the current User. This ensures
         /// that the Document object is only instantiated once.