Bug 1100860 - [email/UI] message_reader should filter move targets

The message_list card already does this.  Without this fix it's possible to break the back-end, at least for ActiveSync.  Spinning off a separate bug to harden the back-end, specifically ActiveSync.
Merge pull request #26046 from DouglasSherk/1093862-callscreen-ended-calls

Bug 1093862 - Make Callscreen not respond to user input while there are no currently handled calls. r=gtorodelvalle, r=thills
Conflicts:
	apps/callscreen/js/calls_handler.js
	apps/callscreen/test/unit/calls_handler_test.js