Set SPHINXERRORHANDLING environment variable to '' in build workflow

Author: m-aciek

.github/workflows/update-and-build.yml

@@ -103,7 +103,7 @@ jobs:
       - run: make -e SPHINXOPTS="--color -D language='pl' -W --keep-going" ${{ matrix.format }}
         working-directory: ./Doc
         env:
-          SPHINXERRORHANDLING: 0
+          SPHINXERRORHANDLING: ''
       - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
         if: success() || failure()
         with: