I recently had to update one of my model's properties from type *
StringProperty* to *TextProperty* in order to overcome the restrictive limit 
(a maximum of 500 characters). That wasn't a problem till I realized some of 
my old queries like:

SomeEntity.gql('WHERE property1 != :1',None) 

 where property1 is a property in the model couldn't work :-(.

The query previously worked, and it did help me to only fetch those entities 
that had a value set for property1.

How can I efficiently obtain the same results in this scenario where the 
type is *TextProperty*?

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