SAM-2292: Item Stem validation issues when using Rich text / Attachments format in Options

git-svn-id: https://source.sakaiproject.org/svn/sam/branches/sakai-10.x@308492 66ffb92e-73f9-0310-93c1-f5514f145a0a
SAM-2329: Student cannot edit EMI response in Firefox

git-svn-id: https://source.sakaiproject.org/svn/sam/branches/sakai-10.x@308493 66ffb92e-73f9-0310-93c1-f5514f145a0a