tcl proc – checking for an empty field

Hello,

Can anyone tell me what the syntax for check for a blank field is in TCL?

I need to check if PV19 is empty and if it is I kill the message.  

My syntax for doing this is:

   if { [cequal $PV19fld “”] } {

         lappend dispList “KILL $mh”

      }

However, this works but it generates a message  in the testing tool and also writes to the log file ” ‘tps_ftp_client_filter ‘ returned bogus strMsgId ‘message0’ — ignored.

What is the best way to do this cleanly without getting this message?

Thank you.

Femina