[Asterisk-Dev] Interesting AEL / Variable issue

[Jerris, Michael MI]

> Corey Frang

> Alright, So, I'm trying to think of a good way around this problem.
> 
>                 followRing=${DB(FOLLOWMERING/${followMeExtension})};
> 
> Is a line I have in my AEL dialplan.  This is getting 
> rewritten to Set(followRing=$[ ..... ])
> 
> The problem is, the DB() function can return NULL, which 
> casues an ast_expr2.fl yyeror warning.
> 
> Without wrapping everything in DBExists() function calls, Is 
> there a way we can update the asterisk expressions to assume 
> a $[ ] is meant to be just plain empty?

You can use DBExists and ${DBRESULT} to accomplish this.