Don't flag missing translations of empty strings

I have a custom control used in a lot of places in my current project. This control has three properties, WarningText, TrimStart, and TrimEnd. Since I updated to version 1.105.6740, ResX Manager has started complaining about missing translations for these properties, even though these properties are empty in the Neutral language. So I end up with 100's of needless warnings (which makes it a challenge to find warnings I care about).

Yes, I can go through and mark all of these properties Invariant, but that's a lot of useless work, and has the negative side effect that if I ever do provide values for some of those properties, then they won't be translated or even flagged as needing translation.