'Continuing a session' from the 'Tutorial' does not work.

[ryanrudak]

The example of 'Continuing a session' from the 'Tutorial' section does not work.

The line 'available_slots = json.loads(intent_message.custom_data)' gives the following error:

Nov 9 22:49:50 INFO:snips_skill_server_lib::runner: [script][err] Traceback (most recent call last):
Nov 9 22:49:50 INFO:snips_skill_server_lib::runner: [script][err] File "_ctypes/callbacks.c", line 234, in 'calling callback function'
Nov 9 22:49:50 INFO:snips_skill_server_lib::runner: [script][err] File "/var/lib/snips/skills/snips-script-skill/venv/lib/python3.5/site-packages/hermes_python/ffi/wrappers.py", line 61, in convert_arguments_when_invoking_function
Nov 9 22:49:50 INFO:snips_skill_server_lib::runner: [script][err] return func(hermes_client, *parsed_args)
Nov 9 22:49:50 INFO:snips_skill_server_lib::runner: [script][err] File "./action-script.py", line 247, in music_section
Nov 9 22:49:50 INFO:snips_skill_server_lib::runner: [script][err] available_slots = json.loads(intentMessage.custom_data)
Nov 9 22:49:50 INFO:snips_skill_server_lib::runner: [script][err] File "/usr/lib/python3.5/json/init.py", line 312, in loads
Nov 9 22:49:50 INFO:snips_skill_server_lib::runner: [script][err] s.class.name))
Nov 9 22:49:50 INFO:snips_skill_server_lib::runner: [script][err] TypeError: the JSON object must be str, not 'NoneType'