[2.2.x] Refs #30323 -- Prevented crash of autoreloader when get_resolver().urlconf_module raising an exception.

Backport of 0636d4d2aa from master

django/utils/autoreload.py

@@ -269,7 +269,12 @@ class BaseReloader:
         from django.urls import get_resolver
         # Prevent a race condition where URL modules aren't loaded when the
         # reloader starts by accessing the urlconf_module property.
-        get_resolver().urlconf_module
+        try:
+            get_resolver().urlconf_module
+        except Exception:
+            # Loading the urlconf can result in errors during development.
+            # If this occurs then swallow the error and continue.
+            pass
         logger.debug('Apps ready_event triggered. Sending autoreload_started signal.')
         autoreload_started.send(sender=self)
         self.run_loop()

docs/releases/2.2.1.txt

@@ -64,3 +64,6 @@ Bugfixes
   permissions for proxy models if the target permissions already existed. For
   example, when a permission had been created manually or a model had been
   migrated from concrete to proxy (:ticket:`30351`).
+
+* Fixed a regression in Django 2.2 that caused a crash of :djadmin:`runserver`
+  when URLConf modules raised exceptions (:ticket:`30323`).