Commits on Jul 29, 2020

1. [BUGFIX lts] Prevent <base target="_parent"> from erroring in Histo… …

   …ryLocation
   
   It is perfectly valid to have a `<base>` element without an `href`
   attribute but the code previously assumed that if a `<base>` was present
   that it **must** contain an `href`.
   
   Specifically, prior to this change if you had a `<base>` like:
   
   ```html
   <base target="_parent">
   ```
   
   You would get the following error:
   
   ```
   Uncaught TypeError: Cannot read property 'replace' of null
   ```
   
   See https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base for
   more details on usage of `<base>` without an `href`.

   

   rwjblue committed Jul 29, 2020
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