fix: a version may not exist, checkout of gh-pages skipped

Author: oesteban

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

@@ -45,12 +45,6 @@ jobs:
       run: |
           make -C docs/ SPHINXOPTS="-W" BUILDDIR="$HOME/docs" CURBRANCH="${CURBRANCH:-html}" html
 
-    - name: Checkout gh-pages
-      if: "!startsWith(github.ref, 'refs/tags/') || (github.event.pull_request.merged == true)"
-      run: |
-        git fetch
-        git checkout -b gh-pages origin/gh-pages
-
     - name: Push created tag to gh-pages
       if: startsWith(github.ref, 'refs/tags/')
       run: |
@@ -59,7 +53,8 @@ jobs:
             echo "Could not identify release series"
             exit 1
         fi
-        git rm -r ${MAJOR_MINOR}/
+        git checkout -b gh-pages origin/gh-pages
+        git rm -r ${MAJOR_MINOR}/ || true
         # It is fundamental that the directory does not exist at all.
         rm -rf ${MAJOR_MINOR}
         cp -r $HOME/docs/$CURBRANCH $PWD/${MAJOR_MINOR}
@@ -73,6 +68,7 @@ jobs:
             echo "$CURBRANCH is not the default development branch"
             exit 1
         fi
+        git checkout -b gh-pages origin/gh-pages
         git rm -r master/
         # It is fundamental that the directory does not exist at all.
         rm -rf master