I don't know what to tell you. If you set the field to an empty string, then DMZ has to assume you want to save it. An empty string is not a NULL, and when inserting new data, DMZ only excludes NULLs from the query.
The best solution is to not set fields you want to be NULL to an empty string.
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But how exactly do I do that??.. there is a bunch of text fields in my form.. and the user should be able to write on whichever he chooses to... Basically, those fields should be numeric but NOT required.
I would like to keep my controller action as clean as possible (which is why im using your array extension and In only doing)