hotfix: dont_update_if_missing

frappe/model/document.py

@@ -48,6 +48,7 @@ def get_controller(doctype):
 class Document(BaseDocument):
 	def __init__(self, arg1, arg2=None):
 		self.doctype = self.name = None
+
 		if arg1 and isinstance(arg1, basestring):
 			if not arg2:
 				# single
@@ -72,6 +73,8 @@ class Document(BaseDocument):
 			# incorrect arguments. let's not proceed.
 			raise frappe.DataError("Document({0}, {1})".format(arg1, arg2))
 
+		self.dont_update_if_missing = []
+
 	def load_from_db(self):
 		if not getattr(self, "_metaclass", False) and self.meta.issingle:
 			self.update(frappe.db.get_singles_dict(self.doctype))