Remove entry point check during extension loading.

vispa/static/js/extensions.js

@@ -41,20 +41,17 @@ define(["jquery", "emitter", "vispa/module", "vispa/ui"], function($, Emitter, M
       var self = this;
       this.extensionsLoading++;
 
-      // check if the entry point, i.e. the extension.js file, exists
-      var entryPoint = "extensions/" + name + "/static/js/extension";
-
-      $.ajax({ url: entryPoint + ".js", type: "HEAD" }).fail(function() {
-        self._checkExtensionsLoaded();
-      }).done(function() {
-        require([entryPoint], self.registerExtension.bind(self), function(err) {
+      require(
+        ["extensions/" + name + "/static/js/extension"],
+        this.registerExtension.bind(this),
+        function(err) {
           if (vispa.args.global.devMode) {
             self.logger.error("extension '%s' failed to load due to: %s",
               err.requireModules[0].split("/")[1], err.requireType);
           }
           self._checkExtensionsLoaded();
-        });
-      });
+        }
+      );
     },
     
     start: function start() {