Fix some build issues (module not in requirements)

Author: ArzhelaR

.github/workflows/model-view-ci.yml

@@ -23,7 +23,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install flake8 pytest numpy coverage pygame matplotlib scipy shapely
+        pip install flake8 pytest numpy coverage pygame matplotlib scipy shapely yaml
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Lint with flake8
       run: |