officejs_support_request_ui: Support events with non accessible sender in RSS

To be consistent with slapos.core RSS and default values of fields
in ERP5, where we only check the permission on the "context" document
and tolerate displaying properties of context document even if
accessing some properties of related documents caused an error.

See also nexedi/slapos.core!433

bt5/erp5_officejs_support_request_ui/SkinTemplateItem/portal_skins/erp5_officejs_support_request/SupportRequestModule_getEventList.py

@@ -50,10 +50,10 @@ for brain in portal.portal_simulation.getMovementHistoryList(
         # XXX or {author} commented on {support_request} / {author} opened new Ticket: {support_request} ?
         'title': support_request_title,
         'category': support_request_category,
-        'author': brain.node_title,
+        'author': event.getSourceTitle(checked_permission="View"),
         'link': support_request_link,
         'description': event.asStrippedHTML(),
-        'pubDate': brain.date,
+        'pubDate': event.getStartDate(),
         'guid': event.getSourceReference() or event.absolute_url(),
         'thumbnail': ( # XXX this is not really a thumbnail, but it's what RSS style uses for <enclosure/>
                        # Also, with this `thumbnail` it will look good for image, and most of the time

bt5/erp5_officejs_support_request_ui_test/TestTemplateItem/portal_components/test.erp5.testSupportRequest.py

@@ -574,6 +574,27 @@ class TestSupportRequestRSSSNonVisibleSupportRequest(SupportRequestRSSTestCase,
     self.assertFalse(rss.bozo)
 
 
+class TestSupportRequestRSSSNonVisibleSender(SupportRequestRSSTestCase, DefaultTestRSSMixin):
+  """Edge case test for support request RSS for an event (visible by user) by a sender not visible by user.
+  """
+  def afterSetUp(self):
+    super(TestSupportRequestRSSSNonVisibleSender, self).afterSetUp()
+    unknown_sender = self.portal.person_module.newContent()
+    unknown_sender.manage_permission('View', ['Manager'], 0)
+    unknown_sender.manage_permission('Access contents information', ['Manager'], 0)
+    self.event.setSourceValue(unknown_sender)
+    self.tic()
+
+  def _checkRSS(self, response):
+    self.assertEqual(httplib.OK, response.getStatus())
+    rss = feedparser.parse(response.getBody())
+    item, = rss.entries
+    # no author for this event, because sender could not be access
+    self.assertFalse(item.get('author'))
+    # https://pythonhosted.org/feedparser/bozo.html#advanced-bozo
+    self.assertFalse(rss.bozo)
+
+
 class TestSupportRequestRSSSNonVisibleAttachment(SupportRequestRSSTestCase, DefaultTestRSSMixin):
   """Edge case test for support request RSS for an event (visible by user) with attachment not visible by user.
   """