Null List Problem

[Joe1]

Hello my dear friends
I installed Dynamo last version (1.3.1) and i have a problem with some lists, these are nulls but Dynamo doesn’t assign null to them (shown in uploaded image) and i can’t convert them to 0 with list.ReplaceNull code. what should i do? Anyone can help me?
thank you very much!

[Vikram_Subbaiah]

@Joe1 These aren’t nulls. They are empty strings

[Joe1]

thanks dear vikram