_finishDistribute in the experimental patch-dom

[stiv...@gmail.com]

Hello, I'm trying to use the experimental "patch-dom", but I came across an small problem(The patch does seem to work though):

There is an exception  throwed by the use of it :

TypeError: Illegal invocation
    at TemplateInstance.Polymer.Base._finishDistribute (VM118 patch-dom.html:48)
    at TemplateInstance._readyClients (VM68 ready.html:127)
    at TemplateInstance._ready (VM68 ready.html:107)
    at TemplateInstance._tryReady (VM68 ready.html:93)
    at TemplateInstance._constructorImpl (VM111 templatizer.html:377)
    at new TemplateInstance (VM111 templatizer.html:132)
    at HTMLTemplateElement.stamp (VM111 templatizer.html:431)
    at HTMLTemplateElement._ensureInstance (VM116 dom-if.html:128)
    at HTMLTemplateElement._render (VM116 dom-if.html:108)
    at Debouncer.complete (VM83 debounce.html:53)

A code reproducing this problem could be found in here:
http://jsbin.com/qawevemaqe/edit?html,output

Debugging the exception, it does fail on an element of type TemplateInstance, in which_the useContent property is undefined and firstChild property throws the exception described above.

Reviewing the code, I've found that the _finishDistribute in polymer.mini(https://github.com/Polymer/polymer/blob/master/src/mini/shady.html) does have a validation for its execution:

if (this._useContent) => process shady dom, else => It does nothing.

The patch doesn't use the _useContent variable at all, might it be lacking of the check of the _useContent variable before of executing anything?

I'm not sure if this must be reported as an issue on github as it is an experimental feature.

Thank you in advance.