Don't crash when closing composer: Bug #739141
Don't crash when closing composer: Bug #739141

This also has the effect of avoiding excessive draft saves due to
the multiple From: widget's changed signal firing even though the
account didn't actually change.

emersion/geary,jimbonator/geary,robol/geary,aatishnn/geary,glebihan/geary,robol/geary,tshikaboom/geary,martinra/geary,githubnemo/geary,martinra/geary,mjog/geary,emersion/geary,mjog/geary,aatishnn/geary,emersion/geary,AtticHacker/geary,glebihan/geary,tshikaboom/geary,tshikaboom/geary,githubnemo/geary,aatishnn/geary,mjog/geary,jimbonator/geary,githubnemo/geary,robol/geary,AtticHacker/geary,martinra/geary,glebihan/geary,AtticHacker/geary,jimbonator/geary