The method described by eschwartz is likely the best going forward.
If you have already imported the new "real" book you can merge it with the existing "hollow" book record. Select the "hollow" original book entry and then select the newly imported "real" book (selection order is important) and then press M to merge the two records.
There is a preference setting in Preferences>Adding books that can automate the merge on import (automerge). This can work well, but will occasionally fail when the titles differ (e.g. original record has just the title and the new book has a subtitle added to the title, ...).
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