[fix] Fixed PDF validation check in run-qa-checks script

Author: pandafy

.github/workflows/ci.yml

@@ -32,6 +32,7 @@ jobs:
 
       - name: Install test dependencies
         run: |
+          sudo apt install poppler-utils
           pip install -U -r requirements.txt
           pip install pylinkvalidator
 

run-qa-checks

@@ -32,7 +32,7 @@ kill "${pid}"
 
 # Verify PDFs are valid
 for pdf in _build/*/*.pdf; do
-    if ! pdfinfo "$pdf" &> /dev/null; then
+    if ! pdfinfo "$pdf"; then
         echo "$pdf is broken"
     fi
 done