Remove matrix exception

[palango]

There`s no matrix dependency currently, so this would have crashed.

[codecov-io]

Codecov Report

Merging #136 into master will increase coverage by 0.44%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #136      +/-   ##
==========================================
+ Coverage   89.77%   90.22%   +0.44%     
==========================================
  Files          10       10              
  Lines         587      583       -4     
  Branches       60       59       -1     
==========================================
- Hits          527      526       -1     
+ Misses         43       40       -3     
  Partials       17       17

Impacted Files	Coverage Δ
pathfinding_service/service.py	85.32% <0%> (+2.13%)	⬆️

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[Dominik1999]

Alright