GUACAMOLE-526: Only pull primary connection for sharing profile once identifier is known.

guacamole/src/main/webapp/app/manage/controllers/manageSharingProfileController.js

@@ -261,11 +261,12 @@ angular.module('manage').controller('manageSharingProfileController', ['$scope',
     $scope.$watch('sharingProfile.primaryConnectionIdentifier',
         function retrievePrimaryConnection(identifier) {
 
-        // Pull data from existing sharing profile
+        if (identifier) {
             connectionService.getConnection($scope.selectedDataSource, identifier)
             .then(function connectionRetrieved(connection) {
                 $scope.primaryConnection = connection;
             }, requestService.WARN);
+        }
 
     });