Handle missing TimeProgr oven field

[ofalvai]

Fixes #35

[codecov]

Codecov Report

Merging #50 (6fdd26d) into main (82bb365) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
+ Coverage   94.18%   94.20%   +0.02%     
==========================================
  Files           6        6              
  Lines         516      518       +2     
==========================================
+ Hits          486      488       +2     
  Misses         30       30              

Impacted Files	Coverage Δ
custom_components/candy/client/model.py	99.19% <100.00%> (ø)
custom_components/candy/sensor.py	98.86% <100.00%> (+<0.01%)	⬆️

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[github-actions]

🎉 HACS repository validator action summary 🎉
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✅ All required keys are present in manifest.json
✅ hacs.json has the 'name' key set
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