Average if range not blank

Hello, quick question please could you tell me how to average a range if range not blank. If range is blank then I would like to return a blank.
many thanks,
A

Many thanks, both.
A

And a follow up question if I may. I am averaging a range that is populated via index match. the formula I am using is an array like this:

=IFNA(INDEX(J10:J13,MATCH($A$13:$A$16,$H$10:$H$13,0)),"")

How do I prevent the average function I am using (thanks Willem) calculating on the blank "". At present it is counting the empty cells as 0.
Many thanks,
A