Merge branch 'account-gallery-fix' into 'develop'

AttachmentRecord: add missing internal fields

Closes #859

See merge request soapbox-pub/soapbox-fe!1095

app/soapbox/normalizers/status.ts

@@ -60,6 +60,10 @@ const AttachmentRecord = ImmutableRecord({
   remote_url: null,
   type: 'unknown',
   url: '',
+
+  // Internal fields
+  account: null,
+  status: null,
 });
 
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