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bbb-exporter stops with scalelite when no meetings

See original GitHub issue

Because scalelite dont return <meetings/> tag when there are no meeting. If there is one or more meeting it runs correctly.

Docker log:

2020-09-11 10:42:19,901 [DEBUG]: https://***.edu.tr:443 "GET /bigbluebutton/api/getMeetings?checksum=*** HTTP/1.1" 200 None
----------------------------------------

Exception happened during processing of request from ('172.18.0.3', 35978)
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/socketserver.py", line 650, in process_request_thread
    self.finish_request(request, client_address)
  File "/usr/local/lib/python3.8/socketserver.py", line 360, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/usr/local/lib/python3.8/socketserver.py", line 720, in __init__
    self.handle()
  File "/usr/local/lib/python3.8/http/server.py", line 427, in handle
    self.handle_one_request()
  File "/usr/local/lib/python3.8/http/server.py", line 415, in handle_one_request
    method()
  File "/usr/local/lib/python3.8/site-packages/prometheus_client/exposition.py", line 152, in do_GET
    output = encoder(registry)
  File "/usr/local/lib/python3.8/site-packages/prometheus_client/openmetrics/exposition.py", line 14, in generate_latest
    for metric in registry.collect():
  File "/usr/local/lib/python3.8/site-packages/prometheus_client/registry.py", line 75, in collect
    for metric in collector.collect():
  File "/app/collector.py", line 55, in collect
    meetings, meetings_data_latency = execution_duration(api.get_meetings)()
  File "/app/helpers.py", line 19, in wrapper
    result = fun(*args, **kwargs)
  File "/app/api.py", line 14, in get_meetings
    if data['response']['meetings'] is None:
KeyError: 'meetings'

Scalelite API getMeetings function response:

<?xml version="1.0"?>
<response>
  <returncode>SUCCESS</returncode>
  <messageKey>noMeetings</messageKey>
  <message>No meetings were found on this server.</message>
</response>

Other BBB API getMeetings function response:

<response>
<returncode>SUCCESS</returncode>
<meetings/>
<messageKey>noMeetings</messageKey>
<message>no meetings were found on this server</message>
</response>