Fixed an error with AIML Parser pickling state

Author: keiffster

.gitignore

@@ -109,3 +109,5 @@ conversations/
 /src/utils/pattern_lister/y-bot.csv
 /src/utils/rdf_lister/rdfs.csv
 /src/utils/botflow/
+/bots/botflow/
+bots/botflow/

src/programy/parser/aiml_parser.py

@@ -61,8 +61,10 @@ def __getstate__(self):
         # __getstate__ is called during the pickling process to determin whih
         # attributes to load, so we remove the ones we don't want pickling
         d = dict(self.__dict__)
-        del d['_errors']
-        del d['_duplicates']
+        if '_errors' in d:
+            del d['_errors']
+        if '_duplicates' in d:
+            del d['_duplicates']
         return d
 
     @property