session: Fix empty service name

session: Fix empty service name

(gdb) bt
#0  __strlen_sse2 () at ../sysdeps/x86_64/strlen.S:32
#1  0x0000003a5ee2810b in marshal_string (pos_after=0x7fffffffdd80, byte_order=108, value=0x0,
    insert_at=20, str=0x6bcc50) at dbus-marshal-basic.c:778
#2  _dbus_marshal_write_basic (str=0x6bcc50, insert_at=20, type=<optimized out>,
    value=<optimized out>, byte_order=108, pos_after=0x7fffffffdd80)
    at dbus-marshal-basic.c:858
#3  0x0000003a5ee15f29 in _dbus_type_writer_write_basic_no_typecode (value=<optimized out>,
    type=115, writer=0x7fffffffdd60) at dbus-marshal-recursive.c:1589
#4  _dbus_type_writer_write_basic_no_typecode (value=<optimized out>, type=115, writer=
    0x7fffffffdd60) at dbus-marshal-recursive.c:2736
#5  _dbus_type_writer_write_basic (writer=0x7fffffffdd60, type=115, value=<optimized out>)
    at dbus-marshal-recursive.c:2311
#6  0x0000003a5ee19c1a in dbus_message_iter_append_basic (value=0x7fffffffde58, type=115, iter=
    0x7fffffffdd50) at dbus-message.c:2563
#7  dbus_message_iter_append_basic (iter=0x7fffffffdd50, type=115, value=0x7fffffffde58)
    at dbus-message.c:2506
#8  0x00000000004597ed in connman_dbus_property_append_basic (iter=0x7fffffffddd0, key=
    0x479539 "Name", type=115, val=0x7fffffffde58) at src/dbus.c:123
#9  0x000000000045e11b in connman_dbus_dict_append_basic (dict=0x7fffffffdea0, key=
    0x479539 "Name", type=115, val=0x7fffffffde58) at ./include/connman/dbus.h:112
#10 0x000000000045e8ab in append_notify (dict=0x7fffffffdea0, session=0x6d4580)
    at src/session.c:375
#11 0x000000000045ecf6 in session_notify (user_data=0x6d4580) at src/session.c:498
#12 0x000000000045f885 in session_changed (session=0x6d4580, trigger=
    CONNMAN_SESSION_TRIGGER_SERVICE) at src/session.c:954
#13 0x0000000000460f66 in service_add (service=0x6b4880, name=0x0) at src/session.c:1602
#14 0x0000000000447946 in __connman_notifier_service_add (service=0x6b4880, name=0x0)
    at src/notifier.c:413
#15 0x0000000000442fa1 in __connman_service_create_from_network (network=0x6b4af0)
    at src/service.c:4921
#16 0x00000000004332e4 in network_probe (network=0x6b4af0) at src/network.c:167
#17 0x0000000000433d32 in connman_network_set_group (network=0x6b4af0, group=
    0x699ae0 "hidden_managed_psk") at src/network.c:544
#18 0x000000000041c4a5 in network_added (supplicant_network=0x69cab0) at plugins/wifi.c:856
#19 0x000000000041d39c in callback_network_added (network=0x69cab0)
    at gsupplicant/supplicant.c:396
#20 0x000000000041e878 in add_bss_to_network (bss=0x6a68c0) at gsupplicant/supplicant.c:1023
#21 0x000000000041efa1 in bss_property (key=0x0, iter=0x0, user_data=0x6a68c0)
    at gsupplicant/supplicant.c:1205
#22 0x000000000041f5f9 in interface_bss_added_with_keys (iter=0x7fffffffe300, user_data=
    0x6a70a0) at gsupplicant/supplicant.c:1354
#23 0x0000000000420689 in signal_bss_added (path=
    0x6b7818 "/fi/w1/wpa_supplicant1/Interfaces/39", iter=0x7fffffffe300)
    at gsupplicant/supplicant.c:1783
#24 0x0000000000420cf9 in g_supplicant_filter (conn=0x699770, message=0x6a6b20, data=0x0)
    at gsupplicant/supplicant.c:1998
#25 0x0000003a5ee0f926 in dbus_connection_dispatch (connection=0x699770)
    at dbus-connection.c:4647
#26 0x000000000040c4ab in message_dispatch (data=0x699770) at gdbus/mainloop.c:80
#27 0x0000003edf64410b in g_timeout_dispatch (source=<optimized out>,
    callback=<optimized out>, user_data=<optimized out>) at gmain.c:3895
#28 0x0000003edf6427ed in g_main_dispatch (context=0x698100) at gmain.c:2441
#29 g_main_context_dispatch (context=0x698100) at gmain.c:3014
#30 0x0000003edf642fc8 in g_main_context_iterate (context=0x698100, block=<optimized out>,
    dispatch=1, self=<optimized out>) at gmain.c:3092
#31 0x0000003edf64360d in g_main_loop_run (loop=0x6980c0) at gmain.c:3300
#32 0x000000000042eab6 in main (argc=1, argv=0x7fffffffe6b8) at src/main.c:381
(gdb) f 10
#10 0x000000000045e8ab in append_notify (dict=0x7fffffffdea0, session=0x6d4580)
    at src/session.c:375
375                     connman_dbus_dict_append_basic(dict, "Name",
(gdb) l
370                             ifname = info->entry->ifname;
371                             service = info->entry->service;
372                             bearer = info->entry->bearer;
373                     }
374
375                     connman_dbus_dict_append_basic(dict, "Name",
376                                                     DBUS_TYPE_STRING,
377                                                     &name);
378
379                     connman_dbus_dict_append_dict(dict, "IPv4",