Andrew Nicols d3f62f2aa3 MDL-42989 JavaScript: Check result of navigation IO requests before reporting errors
When making a request which fails, we need to ensure that the AJAX query
was not aborted before displaying the error.

This ensures that if the navigation tree is being requested at the same
time as a page load is being processed, the abortion of the AJAX request is
not displayed before the page reloads.
2013-12-03 14:36:42 +08:00
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