Fixes string variable check.
Fixes string variable check.

ReadyTalk/jitsi-videobridge,juggernaut/jitsi-videobridge,jitsi/jitsi-videobridge,jitsi/jitsi-videobridge,jitsi/jitsi-videobridge,gpolitis/jitsi-videobridge,ReadyTalk/jitsi-videobridge,matteocampana/jitsi-videobridge,bebo/jitsi-videobridge,davidertel/jitsi-videobridge,juggernaut/jitsi-videobridge,parlaylabs/jitsi-videobridge,matteocampana/jitsi-videobridge,gpolitis/jitsi-videobridge,bebo/jitsi-videobridge,parlaylabs/jitsi-videobridge,ReadyTalk/jitsi-videobridge,parlaylabs/jitsi-videobridge,davidertel/jitsi-videobridge,jitsi/jitsi-videobridge,davidertel/jitsi-videobridge,gpolitis/jitsi-videobridge,matteocampana/jitsi-videobridge,bebo/jitsi-videobridge,juggernaut/jitsi-videobridge,parlaylabs/jitsi-videobridge,jitsi/jitsi-videobridge,jitsi/jitsi-videobridge,jitsi/jitsi-videobridge