paginator: report better expcetions

rhodecode/lib/pagination.py

@@ -295,10 +295,10 b' class _Page(list):'
             first = (self.page - 1) * items_per_page
             last = first + items_per_page
             self.items = list(self.collection[first:last])
-        except TypeError:
+        except TypeError as err:
             raise TypeError(
                 "Your collection of type {} cannot be handled "
-                "by paginate.".format(type(self.collection))
+                "by paginate. ERROR:{}".format(type(self.collection), err)
             )
 
         # Unless the user tells us how many items the collections has