If the user inserts in his answer a link to jsfiddle (for example:
http://jsfiddle.net/asd123) without providing some code, the following error is thrown:
Links to jsfiddle.net must be accompanied by code.
The problem is when the user insert more than one link to jsfiddle, without providing some code. Suppose that he insert 3 links. Three duplicate errors will be thrown.
See the following screen shot.
If the user will insert n links to jsfiddle, n errors will be shown.