Merge pull request #107 from adeepkit01/fixnullcomparison

handle null comparison

Author: iMichka

pygccxml/declarations/calldef.py

@@ -85,6 +85,11 @@ def __ne__(self, other):
     def __lt__(self, other):
         if not isinstance(other, self.__class__):
             return self.__class__.__name__ < other.__class__.__name__
+        if other.default_value == None:
+            return False
+        if self.default_value == None:
+            return self.name < other.name \
+                and self.decl_type < other.decl_type
         return self.name < other.name \
             and self.default_value < other.default_value \
             and self.decl_type < other.decl_type