#4 Typo in error_handler.tcl

[Alan Grunwald]

I spotted another typo in the check_response method of ErrorHandler.

On about line 91, where the code is setting up exceptioninfo, it checks whether the jsonanswer dict has a value key.

Sadly it tries to test via

        [dict exists json_answer value]

Sadly this always fails, so useful information is lost from the exception. The code should be

        [dict exists $json_answer value]