"Expression evaluation error in rule" error related to filtering

Specifically Tempo Task Report.
Appian Version: 7.4 (cloud)
Browser: IE 11
Plug-in: Portal to SAIL.

My question is regarding filtering.
Whenever there is null value in the datasubset (whether by default, or through filtering, it will show an error: "Expression evaluation error in rule 'devmytaskstempo'" I am attaching my rule.
I have tried to capture the empty datasubset in many was. I used isnull(local!datasubset), local!datasubset.totalCount, in the if statement. I am stuck here.

Please guide me here. And let me know if you need more info....

rule-devmytasktempo.txt

OriginalPostID-104493

OriginalPostID-104493

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