[Fix] Accessing None type config_refgressors

[ourownstory]

fixes issue #1535 introduced in #1008

[github-actions]

Model Benchmark

Benchmark	Metric	main	current	diff
YosemiteTemps	MAE_val	0.56412	0.56412	0.0%	✅
YosemiteTemps	RMSE_val	0.83161	0.83161	0.0%	✅
YosemiteTemps	Loss_val	0.0004	0.0004	0.0%	✅
YosemiteTemps	MAE	0.98449	0.98449	0.0%	✅
YosemiteTemps	RMSE	1.75389	1.75389	0.0%	✅
YosemiteTemps	Loss	0.00132	0.00132	0.0%	✅
YosemiteTemps	time	37.3835	34.41	-7.95%	🎉
EnergyPriceDaily	MAE_val	5.41157	5.41157	0.0%	✅
EnergyPriceDaily	RMSE_val	6.71538	6.71538	0.0%	✅
EnergyPriceDaily	Loss_val	0.02525	0.02525	0.0%	✅
EnergyPriceDaily	MAE	5.94936	5.94936	0.0%	✅
EnergyPriceDaily	RMSE	7.9833	7.9833	0.0%	✅
EnergyPriceDaily	Loss	0.02579	0.02579	0.0%	✅
EnergyPriceDaily	time	16.4742	15.4	-6.52%	🎉
PeytonManning	MAE_val	0.34955	0.34955	0.0%	✅
PeytonManning	RMSE_val	0.50049	0.50049	0.0%	✅
PeytonManning	Loss_val	0.01771	0.01771	0.0%	✅
PeytonManning	MAE	0.34653	0.34653	0.0%	✅
PeytonManning	RMSE	0.49312	0.49312	0.0%	✅
PeytonManning	Loss	0.01464	0.01464	0.0%	✅
PeytonManning	time	12.9913	12.24	-5.78%	🎉
AirPassengers	MAE_val	30.6285	30.6285	0.0%	✅
AirPassengers	RMSE_val	31.5254	31.5254	0.0%	✅
AirPassengers	Loss_val	0.01277	0.01277	0.0%	✅
AirPassengers	MAE	6.16861	6.16861	0.0%	✅
AirPassengers	RMSE	7.85225	7.85225	0.0%	✅
AirPassengers	Loss	0.00065	0.00065	0.0%	✅
AirPassengers	time	9.15544	8.01	-12.51%	🎉

Model training plots

Model Training

PeytonManning

YosemiteTemps

AirPassengers

EnergyPriceDaily

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (0f034bb) 88.51% compared to head (0f907c6) 88.51%.

Files	Patch %	Lines
neuralprophet/data/split.py	0.00%	1 Missing ⚠️
neuralprophet/df_utils.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1536   +/-   ##
=======================================
  Coverage   88.51%   88.51%           
=======================================
  Files          41       41           
  Lines        5329     5330    +1     
=======================================
+ Hits         4717     4718    +1     
  Misses        612      612           

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