[Freeswitch-users] Can't test for empty variable

Hello all, I'm trying to test the play_and_get_digits variable from here: <action application="play_and_get_digits" data="1 1 1 3000 # '' silence_stream://250 dtmf_get \d 3000"/> Like this: <condition field="${dtmf_get}" expression="^$"> But it's always false... How can I test for an empty (null?) variable? Regards, David Villasmil email: david.villasmil.work@gmail.com phone: +34669448337