Merge pull request #1770 from saurabh6790/ignore_ifnull_in_database_query

[fixes] AttributeError: 'DatabaseQuery' object has no attribute 'ignore_ifnull'

frappe/model/db_query.py

@@ -20,6 +20,7 @@ class DatabaseQuery(object):
 		self.or_conditions = []
 		self.fields = None
 		self.user = None
+		self.ignore_ifnull = False
 		self.flags = frappe._dict()
 
 	def execute(self, query=None, fields=None, filters=None, or_filters=None,