Remove the error alert from LoadScript and LoadCss

[fredck]

In fckeditor.html, there are alerts in the LoadScript and LoadCss function in case of error loading a file. The problem is that the error may get thrown if the page load is interrupted by the user, by click the browser's back button, for example.

Those alerts have only debugging value, mainly useful during a editor setup, but brings no effective value to it. We should either make it configurable, or simply remove those message, which would be the best option, as there are other tools to understand if a file loading is missing (Firebug and Fiddler, for example).

[alfonsoml]

​https://sourceforge.net/tracker/index.php?func=detail&aid=1613777&group_id=75348&atid=543656 has been marked as dup.

[martinkou]

Fixed with [498].

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