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This prevents an infinite loop caused by an error in a ajax block causing error.tpl to be rendered, which causes block.js to get loaded, which causes a new ajax request for all the ajax blocks, which causes error.tpl to be rendered, etc. Also moving this JS file out of the theme directory and into the /js directory, because it's core, not theme. behatnotneeded: Can't test error state via Behat Change-Id: Idc83002dbf5cb8af36d9d33e916da2bdfa5a308f
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