Update javascript/HtmlEditorField.js

we only want this .ss-uploadfield-files - else we get all ss-uploadfield-files wich include the ones not related to #tinymce insertmedia
Define getIDList on UnsavedRelationList

This is to fix a bug that caused CheckboxSetFields to throw an error
when trying to call this function when editing a new DataObject. This
occurred when using the advancedworkflow module.

Thanks to simonwelsh for the majority of the work on this fix.
XHTML formatting <hr> (fixes #8297)
Merge pull request #1258 from robert-h-curry/unsavedrelationlist-getidlist

Define getIDList on UnsavedRelationList
Avoid mid-sentence periods in combined field validation messages

See https://github.com/silverstripe/sapphire/pull/1241
BUG: Fix grid field rendering when the list is null
Merge pull request #1262 from ajshort/grid-field-null-list

BUG: Fix grid field rendering when the list is null