Merge branch 'master' into develop

.github/workflows/github_action_test_suite.yml

@@ -64,7 +64,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install wheel
-        pip install psycopg2-binary
+        pip install psycopg2-binary==2.8.6   # fix issue for Django 2.2
         pip install mysqlclient
         pip install coveralls
         pip install codacy-coverage

evennia/web/static/webclient/js/evennia.js

@@ -195,7 +195,7 @@ An "emitter" object must have a function
         //     to listen to cmdname events.
         //
         var on = function (cmdname, listener) {
-            if (typeof(listener === 'function')) {
+            if (typeof(listener) === 'function') {
                 listeners[cmdname] = listener;
             };
         };