Enforce node != document checks

[lPadier]

Check that node is not document nor null on first iteration.

[moroshko]

Could you explain the problem you are trying to solve?

[lPadier]

In the app I'm building, node.getAttribute('data-suggestion-index') sometimes fails on IE 11 with the following error message:

object does not support property or method getAttribute

Checking that node !== document or null before the first loop iteration should avoid event.target being document.

[moroshko]

Thanks!
Did you test that this change solves the issue in IE11?

[lPadier]

Dispatching a mousedown event on document with this change no longer throws an error on IE11.

[moroshko]

v8.0.1 contains this fix. Thanks!

[Degee]

Actually i am getting exactly the same error with version 9.3.2 of autosuggest

object does not support property or method getAttribute

I think this was not really a solution. Weird thing is that error sometimes randomly dissappears.