Fix custom error messages (#13898)

* Fix custom error messages
Laravel apparently wraps things in ViewException now and so does ignition.  Ideally, we would plug in the same way as ignition, but just fix the old code for now.

* Don't break the ViewException handling if we can't upgrade

app/Exceptions/Handler.php

@@ -49,8 +49,12 @@ class Handler extends ExceptionHandler
 
         // try to upgrade generic exceptions to more specific ones
         if (! config('app.debug')) {
+            if ($exception instanceof \Illuminate\View\ViewException || $exception instanceof \Facade\Ignition\Exceptions\ViewException) {
+                $base = $exception->getPrevious(); // get real exception
+            }
+
             foreach ($this->upgradable as $class) {
-                if ($new = $class::upgrade($exception)) {
+                if ($new = $class::upgrade($base ?? $exception)) {
                     return parent::render($request, $new);
                 }
             }