Hello! I have a group of cells I'm concatenating and my formula is working great. The issue I'm having is that one of the fields I'm pulling from is sometimes blank until it's updated later on. I'd like it so that if the field is blank, it enters my "PENDING" text. Examples below:

My formula is: =CONCATENATE(A1,", ",A2, " - ",C1)

What I currently have:
A B C D E
1 Smith John 1044 Smith, John - 1044
2 Rodgers Aaron Rodgers, Aaron -
3 Lucas Spencer 1087 Lucas, Spencer - 1087
4 Banjo Shawn Banjo, Shawn -

What I'd like to happen:
A B C D E
1 Smith John 1044 Smith, John - 1044
2 Rodgers Aaron Rodgers, Aaron - PENDING
3 Lucas Spencer 1087 Lucas, Spencer - 1087
4 Banjo Shawn Banjo, Shawn - PENDING

I know it involves an IF and I've tried, but I tend to mess stuff up when I start trying to nest functions. Which is what's happening now. Any suggestions would be greatly appreciated