Application does not load tools if credential is not provided for private layer

Hi Kelly. We found this week that this template will not fully load the UI and tools, and that there is likely an unhandled error when it loads a webmap with an authenticated secure layer. Here is a webmap for example with only a basemap and one unshared (owned by different user than owner of app and webmap) layer:

http://esrinortheast.maps.arcgis.com/apps/MapTools/index.html?webmap=3435d9bdcda6485a8cf3f8e749172e9c

Depending on browser and logged in state of ArcGIS Online you may or may not get prompted with the Identity Manager login screen. If you cancel, provide a credential without permissions to the secure layer, or don't receive a prompt at all (sometimes seeing this in Chrome Incognito), the tool UI never loads and it looks like there are some errors in the console.

Just wanted to report it. Let me know if you would like any additional information about the use case, etc.