Correct checks order for github.event

Author: antonwolfy

.github/workflows/build-sphinx.yml

@@ -16,7 +16,7 @@ defaults:
 jobs:
   print:
     name: Print event
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
     - name: Dump GitHub context
       env:
@@ -125,7 +125,7 @@ jobs:
       # https://github.com/marketplace/actions/github-pages-action
       - name: Deploy docs
         if: |
-          !github.event.pull_request.head.repo.fork  &&
+          github.event.pull_request && !github.event.pull_request.head.repo.fork  &&
           (github.ref == 'refs/heads/master' || (startsWith(github.ref, 'refs/heads/release') == true) || github.event_name == 'push' && contains(github.ref, 'refs/tags/'))
         uses: peaceiris/[email protected]
         with:
@@ -134,7 +134,7 @@ jobs:
 
       - name: Publish pull-request docs
         if: |
-          !github.event.pull_request.head.repo.fork  && github.event.pull_request && github.event.action != 'closed'
+          github.event.pull_request && !github.event.pull_request.head.repo.fork && github.event.action != 'closed'
         uses: peaceiris/[email protected]
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
@@ -149,7 +149,7 @@ jobs:
 
       - name: Comment with URL to published pull-request docs
         if: |
-          !github.event.pull_request.head.repo.fork  && github.event.pull_request && github.event.action != 'closed'
+          github.event.pull_request && !github.event.pull_request.head.repo.fork && github.event.action != 'closed'
         env:
           PR_NUM: ${{ github.event.number }}
         uses: mshick/[email protected]
@@ -160,7 +160,7 @@ jobs:
 
   clean:
     if: |
-      !github.event.pull_request.head.repo.fork  && github.event.pull_request && github.event.action == 'closed'
+      github.event.pull_request && !github.event.pull_request.head.repo.fork && github.event.action == 'closed'
 
     needs: build-and-deploy