"Render node exists without concomitant env" in 1.13.4

[thec0keman]

When upgrading from Ember 1.13.3 -> 1.13.4 we have several tests that are now failing with the error Uncaught Error: Assertion Failed: BUG: Render node exists without concomitant env. .

At least one example of a failing scenario would be with a template like:

{{#if savedOption}}
  <button {{action "removeOption" on="click"}}></button>
{{else}}
  {{input value=inputValue}}
{{/if}}

(where the action simply nullifies savedOption)

with the following component integration test:

test('you can click an thing and it disappears', function(assert) {
  var component = this.subject();

  component.setProperties({
    savedOption: { id: 5, name: 'Thing '},
  });

  this.$();
  this.$('button').click();

  assert.notExists(this.$('button'), 'The thing disappears');
});

And the exception is raised.

Further, this can have the side effect of not tearing down the test correctly, so that the following test raises a Assertion Failed: You cannot use the same root element (#ember-testing) multiple times.

An example repo is here:
https://github.com/thec0keman/action-input-bug

This is using Ember QUnit 0.4.1.

[thec0keman]

I'm not sure if this is very helpful, but the tests start failing after #5c6b627 commit.

[thec0keman]

After further testing, this is appearing in both integration and unit component tests. I'm also seeing the same failures in 2.0.0-beta2.

It looks like there is some issue with the teardown of the view in the if block, but I am very unfamiliar with the internals of Ember / HTMLBars on this point. @rwjblue would you have any suggestions for further steps to better diagnose this?

[thec0keman]

This is now working in 0.5.2, thanks!