Fix bug when using latest version of Prophet

[hrzn]

Solves a bug with a breaking change in latest version of Prophet 1.1.1

[codecov-commenter]

Codecov Report

Base: 93.74% // Head: 93.73% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (3e7a049) compared to base (e617fdc).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1208      +/-   ##
==========================================
- Coverage   93.74%   93.73%   -0.01%     
==========================================
  Files          83       83              
  Lines        8407     8394      -13     
==========================================
- Hits         7881     7868      -13     
  Misses        526      526              

Impacted Files	Coverage Δ
darts/models/forecasting/exponential_smoothing.py	100.00% <ø> (ø)
darts/models/forecasting/prophet_model.py	94.24% <100.00%> (ø)
darts/timeseries.py	92.23% <0.00%> (-0.07%)	⬇️
...arts/models/forecasting/torch_forecasting_model.py	87.45% <0.00%> (-0.05%)	⬇️
darts/models/forecasting/block_rnn_model.py	98.24% <0.00%> (-0.04%)	⬇️
darts/models/forecasting/nhits.py	99.27% <0.00%> (-0.01%)	⬇️
darts/datasets/__init__.py	100.00% <0.00%> (ø)

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[dennisbader]

LGTM, thanks!