Prevent model issues when preset 0 doesn't exists

[frenck]

Proposed Changes

Fixes:

2021-11-27 13:34:25 ERROR (MainThread) [aiohttp.server] Error handling request
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/aiohttp/web_protocol.py", line 422, in _handle_request
    resp = await self._request_handler(request)
  File "/usr/local/lib/python3.9/site-packages/aiohttp/web_app.py", line 499, in _handle
    resp = await handler(request)
  File "/usr/local/lib/python3.9/site-packages/aiohttp/web_middlewares.py", line 119, in impl
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/security_filter.py", line 60, in security_filter_middleware
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/forwarded.py", line 98, in forwarded_middleware
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/request_context.py", line 24, in request_context_middleware
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/ban.py", line 78, in ban_middleware
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/auth.py", line 138, in auth_middleware
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/view.py", line 135, in handle
    result = await result
  File "/usr/src/homeassistant/homeassistant/components/config/config_entries.py", line 157, in post
    return await super().post(request, flow_id)
  File "/usr/src/homeassistant/homeassistant/components/http/data_validator.py", line 62, in wrapper
    result = await method(view, request, *args, **kwargs)
  File "/usr/src/homeassistant/homeassistant/helpers/data_entry_flow.py", line 110, in post
    result = await self._flow_mgr.async_configure(flow_id, data)
  File "/usr/src/homeassistant/homeassistant/data_entry_flow.py", line 246, in async_configure
    result = await self._async_handle_step(flow, cur_step["step_id"], user_input)
  File "/usr/src/homeassistant/homeassistant/data_entry_flow.py", line 320, in _async_handle_step
    result: FlowResult = await getattr(flow, method)(user_input)
  File "/usr/src/homeassistant/homeassistant/components/wled/config_flow.py", line 39, in async_step_user
    return await self._handle_config_flow(user_input)
  File "/usr/src/homeassistant/homeassistant/components/wled/config_flow.py", line 91, in _handle_config_flow
    device = await wled.update()
  File "/usr/local/lib/python3.9/site-packages/backoff/_async.py", line 133, in retry
    ret = await target(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/wled/wled.py", line 243, in update
    self._device = Device(data)
  File "/usr/local/lib/python3.9/site-packages/wled/models.py", line 575, in __init__
    self.update_from_dict(data)
  File "/usr/local/lib/python3.9/site-packages/wled/models.py", line 608, in update_from_dict
    _presets.pop("0")
KeyError: '0'

As reported on the WLED Discord

[codecov]

Codecov Report

Merging #489 (f8ae2a3) into main (abeb437) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #489   +/-   ##
=======================================
  Coverage   57.14%   57.14%           
=======================================
  Files           4        4           
  Lines         546      546           
  Branches      128      128           
=======================================
  Hits          312      312           
  Misses        214      214           
  Partials       20       20           

Impacted Files	Coverage Δ
src/wled/models.py	72.97% <0.00%> (ø)

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