Reduce PyCharm warnings

[codecov-commenter]

Codecov Report

Merging #165 (4424f22) into main (70626d8) will decrease coverage by 0.06%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #165      +/-   ##
==========================================
- Coverage   94.09%   94.03%   -0.07%     
==========================================
  Files         113      113              
  Lines        4353     4359       +6     
==========================================
+ Hits         4096     4099       +3     
- Misses        257      260       +3     

Impacted Files	Coverage Δ
...nd_vehicle_capacity_utilization_analysis_report.py	91.60% <ø> (ø)
...previews/container_flow_by_vehicle_type_preview.py	92.30% <ø> (ø)
...cle_type_adjustment_per_vehicle_analysis_report.py	100.00% <100.00%> (ø)
...d_and_outbound_vehicle_capacity_analysis_report.py	100.00% <100.00%> (ø)
...nflowgen/analyses/yard_capacity_analysis_report.py	98.18% <100.00%> (+0.03%)	:arrow_up:
...en/domain_models/data_types/storage_requirement.py	100.00% <100.00%> (ø)
...s/inbound_and_outbound_vehicle_capacity_preview.py	96.00% <100.00%> (ø)
...nd_and_outbound_vehicle_capacity_preview_report.py	98.11% <100.00%> (+0.07%)	:arrow_up:
...wgen/previews/vehicle_capacity_exceeded_preview.py	88.88% <100.00%> (ø)
...eviews/vehicle_capacity_exceeded_preview_report.py	98.30% <100.00%> (+0.02%)	:arrow_up:
... and 2 more

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