[REVIEW] fix for fdo#46816, don't show error message for empty range name in Define Names

Hey, [1] improves the dialog a bit. The error message is a bit misleading and we can just use the disabled Add button as sign that you can't add an empty range name. It would be nice if this could be cherry-picked to 3-5 and maybe 3-5-1. Regards, Markus [1] http://cgit.freedesktop.org/libreoffice/core/commit/?id=6e93e78c85e0c4eea174483f1d27ee38fd00ee21

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