Some pages cannot be saved due to invalid page terms encoding
When attempting to save an asset page it would raise a mysql error when trying to update the page terms.
the asset in question had a .txt thumbnail - but that file seemed to contain a binary.
Looks like we have some assets that have broken .txt thumbnails.
We should either check the text for a valid encoding before attempting to insert it into the page terms or we should at least catch the error and make sure processing can proceed.
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