#7531: [HttpKernel][Config] FileLocator adds NULL as global resource path
merged branch ro0NL/master (PR #7537)

This PR was submitted for the master branch but it was merged into the 2.1 branch instead (closes #7537).

Discussion
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#7531: [HttpKernel][Config] FileLocator adds NULL as global resource path

Fixed FileLocator in HttpKernel\Config package if global path ($path) is NULL (default).

Commits
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8a8239d #7531: [HttpKernel][Config] FileLocator adds NULL as global resource path
[HttpKernel] tweaked previous merge