Small fix for usage of (tree) player

Author: linev

scripts/JSRootCore.js

@@ -85,7 +85,7 @@
    }
 } (function(JSROOT) {
 
-   JSROOT.version = "dev 14/12/2015";
+   JSROOT.version = "dev 15/12/2015";
 
    JSROOT.source_dir = "";
    JSROOT.source_min = false;

scripts/JSRootPainter.js

@@ -6619,6 +6619,7 @@
 
    JSROOT.HierarchyPainter.prototype.canDisplay = function(item, drawopt) {
       if (item == null) return false;
+      if ('_player' in item) return true;
       var handle = JSROOT.getDrawHandle(item._kind, drawopt);
       return (handle!=null) && ('func' in handle);
    }
@@ -6630,6 +6631,7 @@
       function display_callback() { JSROOT.CallBack(call_back, painter, itemname); }
 
       h.CreateDisplay(function(mdi) {
+
          if (!mdi) return display_callback();
 
          var item = h.Find(itemname);