Fix issue with sorting of non-polymorphic inlines in polymorphic inlines

Author: fdintino

nested_admin/static/nested_admin/dist/nested_admin.js

@@ -161,7 +161,7 @@ function createSortable($group) {
         },
         helper: 'clone',
         opacity: 0.6,
-        maxLevels: 3,
+        maxLevels: 0,
         connectWith: '.djn-items',
         tolerance: 'intersection',
         // Don't allow dragging beneath an inline that is marked for deletion
@@ -172,7 +172,7 @@ function createSortable($group) {
             if (isPolymorphic) {
                 const childModels = parentItem.closest('.djn-group').data('inlineFormset').nestedOptions.childModels;
                 const inlineModel = currentItem.data('inlineModel');
-                if (childModels.indexOf(inlineModel) === -1) {
+                if (childModels && childModels.indexOf(inlineModel) === -1) {
                     return false;
                 }
             }

nested_admin/static/nested_admin/dist/nested_admin.js.map

@@ -53,6 +53,7 @@
     'DIRS': selenosis.settings.TEMPLATES[0]['DIRS'],
     'APP_DIRS': True,
     'OPTIONS': {
+        'debug': True,
         'string_if_invalid': 'INVALID {{ %s }}',
         'context_processors': [
             'django.contrib.auth.context_processors.auth',