Fix Exception message escaping rendered by ErrorHandler
ErrorHandler renders an exception HTML page, it uses un-escaped properties from the related Exception class to render the stacktrace. The security issue comes from the fact that the stacktraces were also displayed in non-
ErrorHandler class now escapes all properties coming from the related Exception, and the stacktrace is not displayed anymore in non-
I would like to thank Luka Sikic for reporting & Yonel Ceruto and Jérémy Derussé for fixing the issue.