Quote:
Originally Posted by itimpi
Trailing commas do not seem to be an issue as Calibre will do that itself if you add a tag via the keyboard, and then is happy to strip it off when you press OK.
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My assumption is that the OP is creating a custom column with a fixed set of values. The "set of values" is a comma-separated list provided when defining the column. Calibre splits the list apart into components, then each component has leading and trailing spaces removed. Because of this processing, a leading comma, a trailing comma, or two commas in a row will result in empty values and thus the error message.
I have considered just ignoring empty values as that value is always included as the first element. Perhaps I will make this change.