Retrieve Metadata crashes when pdf doesn't have text

Whenever one of the pdfs in my list doesn't have metadata text, it says
"Pdf does not contain OCRed text"
and then it just pauses. The little circle goes around on the next item down the list but never advances. Then I have to remove that item from the list otherwise it will cause the same problem next time. Then I have to keep doing this for any other pdfs with the same problem.

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