fix empty pip

.github/workflows/pytests.yml

@@ -18,8 +18,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install flake8 pytest
-        python -m pip install 
+        python -m pip install pytest
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Test with pytest
       run: |