ERP5CatalogTool: Display view for portal_catalog when we access it on ERP5 UI

Before this change, `index_html` for Catalog Tool was None that means trying to
access view for CatalogTool from UI always make a function call to the
` __call__` which function was overridden with `searchResults`, which
means everytime someone tried to access `portal_catalog/`, a useless query was
being made and an undesirable query result was displyed on the UI.

In this case, `index_html` is prefered whenever we try to access portal_catalog
from UI.
Also, add test for proper display of view when CatalogTool is accessed from XHTML UI

product/ERP5Catalog/Tool/ERP5CatalogTool.py

@@ -184,6 +184,13 @@ class ERP5CatalogTool(BaseTool, CMFCore_CatalogTool):
           **kw
         )
 
+    security.declareProtected(Permissions.View, 'index_html')
+    def index_html(self):
+      """
+      Override index_html to display the view for Catalog Tool
+      """
+      return self.view()
+
     security.declarePrivate('getCatalogUrl')
     def getCatalogUrl(self, object):
       return self.__url(object)

product/ERP5Catalog/tests/testERP5Catalog.py

@@ -30,6 +30,7 @@
 from random import randint
 import sys
 import unittest
+import httplib
 from AccessControl import getSecurityManager
 from AccessControl.SecurityManagement import newSecurityManager
 from DateTime import DateTime
@@ -3811,6 +3812,18 @@ VALUES
       finally:
         catalog.setSqlCatalogObjectListList(catalog_method_list)
 
+  def test_publish_catalog(self):
+    """When catalog is published by zope, it does not issue a catalog search but
+    renders the default view.
+    """
+    ret = self.publish(
+        self.portal.portal_catalog.getPath(),
+        basic='ERP5TypeTestCase:')
+    self.assertEqual(httplib.OK, ret.getStatus())
+    # check if we did not just publish the result of `str(portal_catalog.__call__())`,
+    # but a proper page
+    self.assertIn('<title>Catalog Tool - portal_catalog', ret.getBody())
+
 def test_suite():
   suite = unittest.TestSuite()
   suite.addTest(unittest.makeSuite(TestERP5Catalog))