The address book sometimes crashes on evo shutdown, because the free'd
AddressbookView is getting signals from its collection of EABViews. This
indicates that the EABViews are not disposed when they should be.

==18541== Invalid memory access of size 4
==18541==    at 0x59ABBB88: set_folder_bar_message (addressbook-view.c:313)
==18541==    by 0x560BAAD5: g_cclosure_marshal_VOID__POINTER (gmarshal.c:601)
==18541==    by 0x560A8BB5: g_closure_invoke (gclosure.c:437)
==18541==    by 0x560B9D35: signal_emit_unlocked_R (gsignal.c:2435)
==18541==    by 0x560B8E25: g_signal_emit_valist (gsignal.c:2194)
==18541==    by 0x560B90D6: g_signal_emit (gsignal.c:2238)
==18541==    by 0x59ADA661: emit_folder_bar_message (e-addressbook-view.c:1298)
==18541==    by 0x560BAAD5: g_cclosure_marshal_VOID__POINTER (gmarshal.c:601)
==18541==    by 0x560A8BB5: g_closure_invoke (gclosure.c:437)
==18541==    by 0x560B9D35: signal_emit_unlocked_R (gsignal.c:2435)
==18541==    by 0x560B8E25: g_signal_emit_valist (gsignal.c:2194)
==18541==    by 0x560B90D6: g_signal_emit (gsignal.c:2238)
==18541==    Address 0x5977E5CC is 12 bytes inside a block of size 164 free'd
==18541==    at 0x55022B75: free (vg_replace_malloc.c:231)
==18541==    by 0x56102119: g_free (gmem.c:186)
==18541==    by 0x560BE6D0: g_type_free_instance (gtype.c:1635)
==18541==    by 0x560AABC0: g_object_last_unref (gobject.c:580)
==18541==    by 0x59ABD0BE: destroy_callback (addressbook-view.c:1063)
==18541==    by 0x560AD1E8: weak_refs_notify (gobject.c:1464)
==18541==    by 0x560EF0E1: g_data_set_internal (gdataset.c:246)
==18541==    by 0x560EE0AD: g_datalist_id_set_data_full (gdataset.c:380)
==18541==    by 0x560AAB2E: g_object_real_dispose (gobject.c:530)
==18541==    by 0x55D13572: ??? (gtkobject.c:381)
==18541==    by 0x55DD4FA1: ??? (gtkwidget.c:6382)
==18541==    by 0x560AACBC: g_object_run_dispose (gobject.c:602)