Changed helpValues to only report ProductHelps that actually have help. Also...

Changed helpValues to only report ProductHelps that actually have help. Also added support for smarter help registration.

lib/python/HelpSys/HelpSystem.py

@@ -116,10 +116,13 @@ class HelpSystem(Acquisition.Implicit, ObjectManager, Item, Persistent):
         self.id=id
 
     def helpValues(self, spec=None):
-        "ProductHelp objects of all Products"
+        "ProductHelp objects of all Products that have help"
         hv=[]
         for product in self.Control_Panel.Products.objectValues():
-            hv.append(product.getProductHelp())
+            productHelp=product.getProductHelp()
+            # only list products that actually have help
+            if productHelp.helpValues():
+                hv.append(productHelp)
         return hv
 
     # Seaching does an aggregated search of all ProductHelp
@@ -169,6 +172,8 @@ class ProductHelp(Acquisition.Implicit, ObjectManager, Item, Persistent):
     meta_type='Product Help'
     icon='p_/ProductHelp_icon'
 
+    lastRegistered=None
+    
     meta_types=({'name':'Help Topic',
                  'action':'addTopicForm',
                  'permission':'Add Documents, Images, and Files'},