fix($location): absUrl() does not return undefined for base href and …

[rvpatkar]

…html5Mode

$location's absUrl incorrectly returned undefined when using base href and html5Mode. Initializaing it to fix this issue.

Closes #11091

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Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[rvpatkar]

I signed it!

[googlebot]

CLAs look good, thanks!

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CLAs look good, thanks!

[gkalpak]

Thx for the PR, but there needs to be at least one test (verifying the fix and guarding against future regressions), before we can merge this.

_{TBH, I'm not even sure what issue this PR fixes.}

[gkalpak]

Closing in favor of #14488 (which also includes a test).