Why the default value is no longer left to '' (empty string)? Allowing NULL should be ok also with having a default value.

Then, changing the database structure for this situation is not going to be backported, all updates of minor 5.0.x and 5.1.x will fail to just restart.

I think a better option is just to allow NULL, let the default to be '' and eventually fix in the code if there is a case in 5.0.x or 5.1.x when NULL is inserted and insert '' -- can you point in the code where the issue was exposed for you? Anyhow, this won't change the structure dramatically to require a version number update.

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