Add time (minutes) mins or leave cell blank

So, cell A1 has the time (09:00), cell A2 has the minutes (60), cell A3 is the sum of A1+A2.

Im using this formula =A1+TIME(0,A2,0) - which is fine, except A1 is sometimes blank, so therefore I would like A3 to be blank.

I thought I could use this: =IF(A1,"","",(A1+TIME(0,A2,0)) But it doesn't work. Any help is appreciated.

Thank you, so obvious now you pointed it out.