We don't ever call group_ensure() with a non-null group, and
libmeanwhile takes steps to ensure a group never has a NULL name,
so this can't happen. But this makes clang happier.
/** @page gtkaccount-signals GtkAccount Signals
@signals
@signal account-modified
@endsignals
@see gtkaccount.h
<hr>
@signaldef account-modified
@signalproto
void (*account-modified)(PurpleAccount *account);
@endsignalproto
@signaldesc
Emitted when the settings for an account have been changed and saved.
@param account The account that has been modified.