Checking DCL Input isBlank

[thabit79BL3]

I am writing to request your assistance with a problem I am encountering with my AutoLisp code. Specifically, I am trying to create a function that will check whether the input of a dcl is blank. If the input is blank, I would like the function to execute one command, and if the input is not blank, I would like the function to execute another command.

I have tried using the following code, but it has not been successful:

(setq result (get_tile rcdName))
(if (or (null result) (equal result ""))
   (progn
      (c:wd_wire rcdWirePointStart rcdWirePointEnd "")
    )
   (progn
       (command .....)
   )
)

Could you please advise me on how I can modify this code to achieve the desired functionality? I would greatly appreciate your assistance.

Thank you for your time and attention.

@paullimapa 

[paullimapa]

hard to tell without the rest of the code including dcl.

but my first guest is that this code:

(setq result (get_tile rcdName))

should look like this?

(setq result (get_tile "rcdName"))

[Sea-Haven]

Maybe, get_tile returned ("6" "" "6" "3/4") for my test of 4 get tiles note second answer is "" which is a blank string. Not a null or nil. Still a string but with no value. Bit like getstring does similar for press Enter. 

[paullimapa]

note: to test, just simply do this:

(setq result "")

then run the OP's code and it'll still return T:

(or (null result) (equal result ""))

[Sea-Haven]

(if (= (strlen result) 0) then its blank. A space etc looks like its blank will return 1.