[ShadyDOM] Exception when removing non-distributed nodes

[justinfagnani]

This code throws:

let child = Polymer.dom(this).querySelector('#not-distributed');
console.assert(Polymer.dom(child).parentNode == this);
Polymer.dom(this).removeChild(child);

Uncaught NotFoundError: Failed to execute 'removeChild' on 'Node': The node to be removed is not a child of this node.

[sorvell]

Good catch, we'll need to check if the element is distributed here.

[sorvell]

Cannot repro. Please re-open if this issues comes back.