I used this formula and if nothing is in the cells I get a #value! until its populated, can you tell me how to keep it from giving me the error?

I used this formula and if nothing is in the cells I get a #value! until its populated, can you tell me how to keep it from giving me the error?

=IF(P30<>"","10","")+IF(P31<>"","10","")+IF(P32<>"","10","")+IF(P33<>"","10","")+IF(P34<>"","10","")