Description of problem:
Entered text with smileys. They got auto-replaced, and then I deleted them (with backspace) and wanted to continue writing.

Version-Release number of selected component:
evolution-3.18.2-1.fc23

Additional info:
reporter:       libreport-2.6.3
backtrace_rating: 4
cmdline:        evolution
crash_function: prevent_from_deleting_last_element_in_body
executable:     /usr/bin/evolution
global_pid:     10427
kernel:         4.2.6-300.fc23.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 prevent_from_deleting_last_element_in_body at e-html-editor-view.c:3922
 #1 key_press_event_process_backspace_key at e-html-editor-view.c:5506
 #2 html_editor_view_key_press_event at e-html-editor-view.c:5688
 #3 _gtk_marshal_BOOLEAN__BOXED at gtkmarshalers.c:86
 #8 gtk_widget_event_internal at gtkwidget.c:7692
 #9 gtk_window_propagate_key_event at gtkwindow.c:7772
 #10 gtk_window_key_press_event at gtkwindow.c:7805
 #11 msg_composer_key_press_event at e-msg-composer.c:2717
 #12 _gtk_marshal_BOOLEAN__BOXEDv at gtkmarshalers.c:131
 #13 _g_closure_invoke_va at gclosure.c:864