fix(videoPanel): 🐛 default for undefined partnerId

Include a check to validate if partnerID is not undefined

Author: tituschewxj

apps/frontend/src/components/VideoPanel/VideoPanel.tsx

@@ -43,7 +43,7 @@ const VideoPanel = () => {
         audio: true,
       })
       .then((stream) => {
-        if (peerInstance) {
+        if (peerInstance && partnerId) {
           const call = peerInstance?.call(partnerId, stream);
           setCallInstance(call);
           setIsCalling(true); // Set isCalling as true since it is the initiator