Fix a bug in the count vectors featuriser: Prevent OOV substitution when the featuriser operates at character level.

Author: samsucik

rasa/nlu/featurizers/count_vectors_featurizer.py

@@ -172,7 +172,7 @@ def _get_message_text(self, message):
         if self.lowercase:
             text = text.lower()
 
-        if self.OOV_token:
+        if self.OOV_token and self.analyzer == "word":
             text_tokens = text.split()
             if hasattr(self.vectorizer, "vocabulary_"):
                 # CountVectorizer is trained, process for prediction