[IMP] website: Script injected in DOM: window.onerror empty params

Before this commit, error thrown by scripts injected in DOM won't return a
clean error on window.onerror.
It would open the crash_manager's show_error's dialog that wouldn't display
any informations except "Script Error." and "Traceback:".
This is because of browser's security reason: it will just give you a
'Script error.' as message and nothing else for security issue.

Now, this kind of error will show a clearer message informing that it is
probably originating from a Javascript file served from a different origin.
There is now also the possibility for developers to handle/override the
behavior when this kind of error is catch to prevent the dialog to open for
example.

Might be of use:
https://blog.sentry.io/2016/05/17/what-is-script-error.html
https://stackoverflow.com/a/7778424
https://danlimerick.wordpress.com/2014/01/18/how-to-catch-javascript-errors-with-window-onerror-even-on-chrome-and-firefox/ (Search for Script Error)

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