live_test_gadget: Tolerate errors in AJAX requests

For example when zope is restarting

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/gadget_live_tests.js.xml

@@ -8,7 +8,7 @@
       <dictionary>
         <item>
             <key> <string>_EtagSupport__etag</string> </key>
-            <value> <string>ts52669278.59</string> </value>
+            <value> <string>ts52670931.35</string> </value>
         </item>
         <item>
             <key> <string>__name__</string> </key>
@@ -22,7 +22,7 @@
             <key> <string>data</string> </key>
             <value> <string encoding="cdata"><![CDATA[
 
-/*global window, rJS, jIO, RSVP, location, document, FormData */\n
+/*global window, rJS, jIO, RSVP, location, document, FormData, console */\n
 /*jslint indent: 2, maxlen: 80, nomen: true */\n
 (function (rJS, jIO, RSVP, window, document, FormData) {\n
   "use strict";\n
@@ -81,6 +81,8 @@
         if (!paused) {\n
           continue_loop = false;\n
         }\n
+      }, function (error) {\n
+        console.error("Error launching live tests", error);\n
       });\n
     }\n
     return queue.push(function () {\n
@@ -92,7 +94,7 @@
     function getLiveTestOutput() {\n
       queue.push(function () {\n
         return jIO.util.ajax({\n
-          type: "POST",\n
+          type: "GET",\n
           url: my_url_read_test\n
         });\n
       }).push(function (evt) {\n
@@ -107,6 +109,8 @@
           data_textarea.scrollTop = data_textarea.scrollHeight;\n
         }\n
         return RSVP.delay(1000);\n
+      }, function (error) {\n
+        console.error("Error refreshing live test output", error);\n
       }).push(function () {\n
         if (continue_loop) {\n
           return getLiveTestOutput();\n
@@ -135,7 +139,7 @@
         </item>
         <item>
             <key> <string>size</string> </key>
-            <value> <int>3370</int> </value>
+            <value> <int>3561</int> </value>
         </item>
         <item>
             <key> <string>title</string> </key>