* e-msg-composer-hdrs.c (e_msg_composer_hdrs_set_from_account): If
@account_name is NULL, pick the default account rather than giving
a g_warning.
* e-msg-composer.c (e_msg_composer_set_headers): Note in the
doc comment that @from can be NULL if you want the default account
(since there is code that expects this).
svn path=/trunk/; revision=8243