Bug 414054: Add explicit message if preference isn't set for about:crashes. r=mano, ui-r=beltzner, a=schrep

toolkit/crashreporter/content/crashes.xhtml

@@ -84,7 +84,15 @@ function findInsertionPoint(reports, date) {
 function populateReportList() {
   var prefService = Cc["@mozilla.org/preferences-service;1"].
                     getService(Ci.nsIPrefBranch);
-  var reportURL = prefService.getCharPref("breakpad.reportURL");
+
+  try {
+    var reportURL = prefService.getCharPref("breakpad.reportURL");
+  }
+  catch (e) {
+    document.getElementById("reportList").style.display = "none";
+    document.getElementById("noConfig").style.display = "block";
+    return;
+  }
   var directoryService = Cc["@mozilla.org/file/directory_service;1"].
                          getService(Ci.nsIProperties);
 
@@ -202,5 +210,6 @@ function clearReports() {
   </table>
 </div>
 <p id="noReports" style="display: none">&noReports.label;</p>
+<p id="noConfig" style="display: none">&noConfig.label;</p>
 </body>
 </html>

toolkit/locales/en-US/crashreporter/crashes.dtd

@@ -2,4 +2,6 @@
 <!ENTITY id.heading                 "Report ID">
 <!ENTITY date.heading               "Date Submitted">
 <!ENTITY noReports.label            "No crash reports have been submitted.">
+<!ENTITY noConfig.label             "This application has not been configured to display crash reports. The preference <code>breakpad.reportURL</code> must be set.">
 <!ENTITY clearReports.label         "Remove Reports">
+