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Jason R. Coombs committed d062ca1

it looks like the Parent class implements this by calling .doc_count on tha reader

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 	def is_empty(self):
 		return not self.doc_count()
 
-	def doc_count(self):
-		return self.collection.count()
-
 	def reader(self, reuse=None):
 		return reuse or reading.IndexReader(self)