Is this not supported, the documentation is not clear
See, section : When null Means null
When choosing a suitable null_value, ensure the following:
It matches the field’s type. You can’t use a string null_value in a field of type date.
It is different from the normal values that the field may contain, to avoid confusing real values with null values.
Eventhough i am trying to convert the null string to "", it is not working, since event itself is not getting created so there is no use of applying filter
I could be wrong but I think from my own testing I've found that if a field that is either an object or a date then it can't be null or empty. My workaround is to check if ![field] and then remove it or set some non-null value.
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