Infinite memory and clash in error handler.

When handling an Unhandled exception, the default error handler path uses debug_war to handle outputting debug information. When calling debug_var, no print argument is passed. Without a print argument, debug_var uses print_r to dump a passed in variable's contents. This consumes all memory, and leads to a crash (500). to add insult to injury, the debug message does not even make it into the apache error.log, even with xdebug installed.