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Updates the realm field `default_code_block_language` to have a default value of an empty string instead of None. Also updates the web-app to check for the empty string and not `null` to indicate no default is set. This means that both new realms and existing realms that have no default set will have the same value for this setting: an empty string. Previously, new realms would have None if no default was set, while realms that had set and then unset a value for this field would have an empty string when no default was set.