bower/codemirror/* return 404, cannot edit online with preview. (BB-12797)

Issue #11253 resolved
tian yu
created an issue

When edit a markdown file online, the follow error shows in console:

GET https://bitbucket.org/*/bower/codemirror/mode/markdown/markdown.js 404 (NOT FOUND)req.load @ main.js:1w.load @ main.js:1b.load @ main.js:1b.fetch @ main.js:1b.check @ main.js:1b.enable @ main.js:1w.enable @ main.js:1(anonymous function) @ main.js:1(anonymous function) @ main.js:1each @ main.js:1b.enable @ main.js:1b.init @ main.js:1(anonymous function) @ main.js:1nrWrapper @ README.md?at=master:5
README.md?at=master:5 Uncaught Error: Script error for: bower/codemirror/mode/markdown/markdown.js

And the editor cannot get preview.