Have wagtailforms register its urls / menu item via hooks, so that wagtailadmin doesn't fail if wagtailforms is absent from INSTALLED_APPS

wagtail/wagtailadmin/templatetags/wagtailadmin_tags.py

@@ -8,7 +8,6 @@ from wagtail.wagtailadmin.menu import MenuItem
 from wagtail.wagtailcore.models import get_navigation_menu_items, UserPagePermissionsProxy
 from wagtail.wagtailcore.util import camelcase_to_underscore
 
-from wagtail.wagtailforms.models import get_form_types
 
 register = template.Library()
 
@@ -47,11 +46,6 @@ def main_nav(context):
 
     request = context['request']
 
-    if get_form_types(): # show this only if forms actually exist
-        menu_items.append(
-            MenuItem(_('Forms'), urlresolvers.reverse('wagtailforms_index'), classnames='icon icon-grip', order=700)
-        )
-
     for fn in hooks.get_hooks('construct_main_menu'):
         fn(request, menu_items)
 

wagtail/wagtailforms/wagtail_hooks.py

@@ -0,0 +1,24 @@
+from django.core import urlresolvers
+from django.conf.urls import include, url
+from django.utils.translation import ugettext_lazy as _
+
+from wagtail.wagtailadmin import hooks
+from wagtail.wagtailadmin.menu import MenuItem
+
+from wagtail.wagtailforms import urls
+from wagtail.wagtailforms.models import get_form_types
+
+
+def register_admin_urls():
+    return [
+        url(r'^forms/', include(urls)),
+    ]
+hooks.register('register_admin_urls', register_admin_urls)
+
+def construct_main_menu(request, menu_items):
+    if get_form_types():  # show this only if forms actually exist.
+        # TODO: Limit this to only show the menu item if the user has permission to access at least one form page
+        menu_items.append(
+            MenuItem(_('Forms'), urlresolvers.reverse('wagtailforms_index'), classnames='icon icon-grip', order=700)
+        )
+hooks.register('construct_main_menu', construct_main_menu)