make aaf work with named, default and dynamic scopes

lib/class_methods.rb

@@ -143,14 +143,10 @@ def aaf_index
     # +limit+ if you specify any active record conditions that further limit 
     # the result. Use +limit+ and +offset+ as AR find_options instead.
     # +page+ and +per_page+ are supposed to work regardless of any 
-    # +conitions+ present in +find_options+.
+    # +conditions+ present in +find_options+.
     def find_with_ferret(q, options = {}, find_options = {})
       if respond_to?(:scope) && scope(:find, :conditions)
-        if find_options[:conditions]
-          find_options[:conditions] = "(#{find_options[:conditions]}) AND (#{scope(:find, :conditions)})"
-        else
-          find_options[:conditions] = scope(:find, :conditions)
-        end
+        find_options[:conditions] ||= '1=1' # treat external scope the same as if :conditions present (i.e. when it comes to counting results)
       end
       return ActsAsFerret::find q, self, options, find_options
     end