Dont use blank cell in array formula

NadoDude

Board Regular
Joined
Jun 24, 2010
Messages
84
What would I put into this array formula

{=SUM(IF((Assignments!$H$2:$H$3008=$A45)*((Assignments!$P$2:$P$3008>=($L45))+(Assignments!$P$2:$P$3008="")>0),IF(Assignments!$P$2:$P$3008="",$M45+1,IF(Assignments!$P$2:$P$3008>($M45)+1,($M45)+1,Assignments!$P$2:$P$3008))-IF(Assignments!$L$2:$L$3008>=$L45,Assignments!$L$2:$L$3008,$L45),0))}

if I don't want it to calculate the row if column L is blank?
 

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