Make widget API use optional

So we can work when popped out into a browser

src/vector/jitsi/index.ts

@@ -49,11 +49,19 @@ let widgetApi: WidgetApi;
             return <string>query[name];
         };
 
+        // If we have these params, expect a widget API to be available (ie. to be in an iframe
+        // inside a matrix client). Otherwise, assume we're on our own, eg. have been popped
+        // out into a browser.
+        const parentUrl = qsParam('parentUrl', true);
+        const widgetId = qsParam('widgetId', true);
+
         // Set this up as early as possible because Riot will be hitting it almost immediately.
+        if (parentUrl && widgetId) {
             widgetApi = new WidgetApi(qsParam('parentUrl'), qsParam('widgetId'), [
                 Capability.AlwaysOnScreen,
             ]);
             widgetApi.expectingExplicitReady = true;
+        }
 
         // Populate the Jitsi params now
         jitsiDomain = qsParam('conferenceDomain');
@@ -62,8 +70,10 @@ let widgetApi: WidgetApi;
         avatarUrl = qsParam('avatarUrl', true); // http not mxc
         userId = qsParam('userId');
 
+        if (widgetApi) {
             await widgetApi.waitReady();
             await widgetApi.setAlwaysOnScreen(false); // start off as detachable from the screen
+        }
 
         // TODO: register widgetApi listeners for PTT controls (https://github.com/vector-im/riot-web/issues/12795)
 
@@ -85,7 +95,7 @@ function joinConference() { // event handler bound in HTML
     switchVisibleContainers();
 
     // noinspection JSIgnoredPromiseFromCall
-    widgetApi.setAlwaysOnScreen(true); // ignored promise because we don't care if it works
+    if (widgetApi) widgetApi.setAlwaysOnScreen(true); // ignored promise because we don't care if it works
 
     const meetApi = new JitsiMeetExternalAPI(jitsiDomain, {
         width: "100%",
@@ -107,7 +117,7 @@ function joinConference() { // event handler bound in HTML
         switchVisibleContainers();
 
         // noinspection JSIgnoredPromiseFromCall
-        widgetApi.setAlwaysOnScreen(false); // ignored promise because we don't care if it works
+        if (widgetApi) widgetApi.setAlwaysOnScreen(false); // ignored promise because we don't care if it works
 
         document.getElementById("jitsiContainer").innerHTML = "";
     });