How do I fill empty rows in a table with Max Count of Months

[Adilet_Yessaliyev]

Hi Everybody! I have created a variable which counts Max Distinct Count of Months -  

vMaxMonthId = Max(Aggr(Count({1<TabYear=$::TabYear, TabFlag -={"''"}>} Total Distinct TabMonth), TabID)-1).

And another one - 

vOct =if(num(TabYear) = Year(Today()) and Month(Today()) <= 10, 0, Sum({1<TabYear=$::TabYear, TabMonth= {'Oct'}>}TabPositive Answers)/
Sum({1<TabYear=$::TabYear, TabMonth= {'Oct'}>}TabPositive Ansewrs+TabNegative Ansewrs)).

Final Magic is: 

$(vOct)/$(vMaxMonthId) and like this for every month. It works fine until Null appears in vMaxMonth while aggregating by TabId Dimension. Example below

So is there any way to replace Null value in Row fo SMS with value '9' in this case?

Thanks in advance