Show an error message if tab loading fails

Dependencies

• [2] QCGCX2BR Generalize lazy tabs
• [3] YPDYBK5G Show dependencies as a tree rather than a list
• [*] IK53RV4V

Change contents

• replacement in src/root/common.tt at line 464
  [2.580]→[2.580:629](∅→∅)
  − $('#[% tabName %]').load("[% uri %]");
  [2.580]

  [2.629]
  + $('#[% tabName %]').load("[% uri %]", function(response, status, xhr) {

  + if (status == "error") {

  + $('#[% tabName %]').html("<div class='alert alert-error'>Error loading tab: " + xhr.status + " " + xhr.statusText + "</div>");

  + }

  + });