fix print format test case

frappe/core/doctype/print_format/test_records.json

@@ -3,6 +3,7 @@
 		"doctype": "Print Format",
 		"name": "_Test Print Format 1",
 		"module": "core",
-		"doc_type": "User"
+		"doc_type": "User",
+		"html": ""
 	}
 ]