Fix TypeError caused by incorrect JQuery call

[AlexeyMz]

Fixes an uncaught exception which happens when a user tries to perform edits and syntaxErrorCheck is false.

Full stack trace:

Uncaught TypeError: Cannot read property 'wrapper' of undefined
    at HTMLDocument.getWrapperElement (codemirror.js:5358)
    at fire (jquery.js:3187)
    at Object.add [as done] (jquery.js:3246)
    at jQuery.fn.init.jQuery.fn.ready (jquery.js:3496)
    at new jQuery.fn.init (jquery.js:2927)
    at jQuery (jquery.js:75)
    at checkSyntax (main.js:357)
    at main.js:252
    at codemirror.js:8247
    at fireCallbacksForOps (codemirror.js:3047)

[LaurensRietveld]

Thanks a bunch!