2010 - Changing #VALUE! error in Calculated Column

I have a calculated column called SUID # that pulls the value from a single line text input called SUID. The formula in SUID # is:

=RIGHT(LEFT(SUID,INT(FIND("=",SUID)-1)),LEN(LEFT(SUID,INT(FIND("=",SUID)-1)))-1)

If SUID is blank, the SUID # column will show #VALUE!

Is it possible to change that error text? I would like it to say "Please Enter the SUID Only on Package Pickup"