Closes #2612 improve missing value handling in compute egfr

[jeffreyad]

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[github-actions]

Package	Line Rate	Health
admiral	98%	✔
Summary	98% (5189 / 5302)	✔

[bms63]

@jeffreyad just checking - this extra line in the input tests for the new lines in the function? Just want to make sure this scenario is covered adequately

[jeffreyad]

@jeffreyad just checking - this extra line in the input tests for the new lines in the function? Just want to make sure this scenario is covered adequately
Yes, added a line to test for missing sex