[ExceptionRender] - Not showing stack trace

[cnizzardini]

What Happened
RunTimeException was thrown and cake debug is not showing stack trace

Notice (8): Undefined variable: trace [CORE/templates/element/exception_stack_trace_nav.php, line 21]
Warning (2): Invalid argument supplied for foreach() [CORE/templates/element/exception_stack_trace_nav.php, line 21]

Expected Behavior
Shows stack trace

Steps to Reproduce
See steps in #64

Potential fix in MixerApiExceptionRenderer::debugViewVars

        if (!Configure::read('debug')) {
            return $viewVars;
        }

Version and Platform (please complete the following information):

• OS/Platform: Alpine/Docker
• CakePHP: 4.2.5
• MixerApi Version: 0.2.9