converse-muc: Handle VCards not being available

dist/converse.js

@@ -66787,7 +66787,7 @@ _converse_core__WEBPACK_IMPORTED_MODULE_3__["default"].plugins.add('converse-muc
         throw new Error("Can't call _converse.getDefaultMUCNickname before the statusInitialized has been fired.");
       }
 
-      const nick = _converse.nickname || _converse.xmppstatus.vcard.get('nickname');
+      const nick = _converse.nickname || _converse.vcards ? _converse.xmppstatus.vcard.get('nickname') : undefined;
 
       if (nick) {
         return nick;

src/headless/converse-muc.js

@@ -147,7 +147,7 @@ converse.plugins.add('converse-muc', {
                 throw new Error(
                     "Can't call _converse.getDefaultMUCNickname before the statusInitialized has been fired.");
             }
-            const nick = _converse.nickname || _converse.xmppstatus.vcard.get('nickname');
+            const nick = _converse.nickname || _converse.vcards ? _converse.xmppstatus.vcard.get('nickname') : undefined;
             if (nick) {
                 return nick;
             } else if (_converse.muc_nickname_from_jid) {

src/headless/dist/converse-headless.js

@@ -45181,7 +45181,7 @@ _converse_core__WEBPACK_IMPORTED_MODULE_3__["default"].plugins.add('converse-muc
         throw new Error("Can't call _converse.getDefaultMUCNickname before the statusInitialized has been fired.");
       }
 
-      const nick = _converse.nickname || _converse.xmppstatus.vcard.get('nickname');
+      const nick = _converse.nickname || _converse.vcards ? _converse.xmppstatus.vcard.get('nickname') : undefined;
 
       if (nick) {
         return nick;