fix($location): strip off empty hash segments when comparing

[tleruitte]

Backported from e93710f

The url is the same whether or not there is an empty # marker at the end.
This prevents unwanted calls to update the browser, since the browser is
automatically applying an empty hash if necessary to prevent page reloads.

Closes #9635

[googlebot]

Thanks for your pull request.

It looks like this may be your first contribution to a Google open source project, in which case you'll need to sign a Contributor License Agreement (CLA) at https://cla.developers.google.com/.

If you've already signed a CLA, it's possible we don't have your GitHub username or you're using a different email address. Check the information on your CLA or see this help article on setting the email on your git commits.

Once you've done that, please reply here to let us know. If you signed the CLA as a corporation, please let us know the company's name.

[tleruitte]

Closed in favour of #10748 . Sorry for the disagreement.