Merge pull request #636 from jitsi/fix_externalConnectUrl_param

Fixes issue with externalConnectUrl hash param when the value is null

connection_optimization/do_external_connect.js

@@ -17,8 +17,11 @@
  */
 (function () {
     var params = getConfigParamsFromUrl();
-
-    var url = params["config.externalConnectUrl"] || config.externalConnectUrl;
+    
+    //Url params have higher proirity than config params
+    var url = config.externalConnectUrl;
+    if(params.hasOwnProperty('config.externalConnectUrl'))
+        url = params["config.externalConnectUrl"];
 
     /**
      * Check if connect from connection.js was executed and executes the handler

modules/API/API.js

@@ -130,7 +130,7 @@ function processMessage(event) {
  */
 function isEnabled () {
     let hash = location.hash;
-    return hash && hash.indexOf("external") > -1 && window.postMessage;
+    return hash && hash.indexOf("external=true") > -1 && window.postMessage;
 }
 
 /**