Finish hooking up Draftail CSS & JS to Django widget

client/src/components/Draftail/index.js

@@ -16,7 +16,7 @@ export const initEditor = (fieldName, options = {}) => {
     field.value = JSON.stringify(rawContentState || {});
   };
 
-  if (options.entityTypes) {
+  if (options && options.entityTypes) {
     // eslint-disable-next-line no-param-reassign
     options.entityTypes = options.entityTypes.map(entity => Object.assign(entity, {
       source: registry.getSource(entity.source),

wagtail/admin/rich_text/editors/draftail.py

@@ -5,9 +5,10 @@ from django.forms import Media, widgets
 from wagtail.admin.edit_handlers import RichTextFieldPanel
 from wagtail.admin.rich_text.converters.contentstate import ContentstateConverter
 from wagtail.core.rich_text import features
+from wagtail.utils.widgets import WidgetWithScript
 
 
-class DraftailRichTextArea(widgets.Textarea):
+class DraftailRichTextArea(WidgetWithScript, widgets.Textarea):
     # this class's constructor accepts a 'features' kwarg
     accepts_features = True
 
@@ -47,5 +48,5 @@ class DraftailRichTextArea(widgets.Textarea):
         return Media(js=[
             'wagtailadmin/js/draftail.js',
         ], css={
-            'all': ['wagtailadmin/css/panels/dratail.css']
+            'all': ['wagtailadmin/css/panels/draftail.css']
         })