Merge pull request #9095 from overleaf/ii-pdf-set-zoom-fix

[web] Pdf zoom throws an error

GitOrigin-RevId: bcb3cde05ca9c65c1cca554b26ea9c7d0fe8d995

services/web/frontend/js/features/pdf-preview/components/pdf-js-viewer.js

@@ -325,11 +325,15 @@ function PdfJsViewer({ url, pdfFile }) {
           break
 
         case 'zoom-in':
-          setScale(pdfJsWrapper.viewer.currentScale * 1.25)
+          if (pdfJsWrapper) {
+            setScale(pdfJsWrapper.viewer.currentScale * 1.25)
+          }
           break
 
         case 'zoom-out':
-          setScale(pdfJsWrapper.viewer.currentScale * 0.75)
+          if (pdfJsWrapper) {
+            setScale(pdfJsWrapper.viewer.currentScale * 0.75)
+          }
           break
       }
     },