Merge pull request #192 from MITx/mm-login-errors-display

Login errors should display on first failure.

lms/templates/login_modal.html

@@ -61,9 +61,10 @@
        function(json) {
          if(json.success) {
            location.href="${reverse('dashboard')}";
-        } else if($('#login_error').length == 0) {
-        $('#login_form').prepend('<div id="login_error">Email or password is incorrect.</div>');
          } else {
+           if($('#login_error').length == 0) {
+             $('#login_form').prepend('<div id="login_error">Email or password is incorrect.</div>');
+           }
            $('#login_error').stop().css("display", "block");
          }
        }