fix issue in ie

[ryanpatrickcook]

seeing issue in ie11 where if copy button exists in document and user tries to transition away from the page and fails when copy button is tearing down

[jkusa]

@ryanpatrickcook thanks for reporting the issue and the PR🙏

Does the error happen all the time on ie11 or is it a timing issue? Does this happen even when a copy is successful?

[ryanpatrickcook]

@jkusa seems to happen all the time. you don't even need to interact with copy-button component. just render it and tear down fails. so in our case, we would just render it on the page (no interaction from user with copy button), and then user would just do a simple transition from say from list page -> show page and transition would fail.

[jkusa]

@ryanpatrickcook Interesting. I wonder what the value of clipboard is on this line in e11:

https://github.com/jkusa/ember-cli-clipboard/pull/50/files#L76

[jkusa]

@ryanpatrickcook you can find this change in v0.11.1.