Total is empty

I resolved the issues finally. 
First of all, I am not completely sure of what change fix the bug but, I created measures separated instead of using Variables in the same measure because I think it created some errors.

After, I separated a little the code proposed by amitchandak  (thank you!) to  understand it better and here is the code: 

VAR T_ProgramName = SUMMARIZE('Dim_Project Database', 'Dim_Project Database'[Project Type], 'Dim_Project Database'[Program Name])

VAR T_SubTotal=
ADDCOLUMNS(T_ProgramName, "Col_Estimado", [Estimated_Resources], "Col_OtrosProyectos",SWITCH(
                [Program Name],
                "Non billable" , IF(PendingResources<=0, 0, IF( PendingResources >= NonBillingResourceCost, NonBillingResourceCost, PendingResources)),
                "Internal Project", IF(( PendingResources - NonBillingResourceCost) >0,PendingResources - NonBillingResourceCost,BLANK()),         
                BLANK()
                )
) 
VAR Total_Cost = SUMX(T_SubTotal, IF([Col_OtrosProyectos] = BLANK(), [Col_Estimado], [Col_OtrosProyectos]))

RETURN   Total_Cost