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Updating Salesforce with empty String.

I stumbled upon a "problem" with the Salesforce Component - or I am actually not sure if the behavior is desired or not.

If I update ( upsert ) values from existing entries in Salesforce, these changes are not recognized since the value is an empty String. To get the desired behavior - I have to replace all "" with null.

I have a few scenarios how I think this is solvable - but, since I don't want to write a helper function and use it in each field I map, I am looking for something more generic.
- Improved SF component, with that option just checkable (replace all "" with null).
- custom component, looking through all rows, replacing "" with null.

So my question is : How can I create this custom component, automatically "recieving" all the rows and work through them - any ideas?

Best Regards