Only handle scroll events when PDFView.pdfDocument is defined (issue 4642) #4645
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Attempted workaround to fix #4642. This should work, and it's a very easy solution, but I'm not completely convinced that this is the best way to handle the issue.
Edit: The reason for my apprehension about it, is that the patch adds code that is unnecessary most of the time to a function that is called a lot.
@dferer Does this fix the issue?