[Fix] Code cleanup (#14843)

diff --git a/erpnext/hr/report/vehicle_expenses/vehicle_expenses.py b/erpnext/hr/report/vehicle_expenses/vehicle_expenses.py
index 93ea11c..2886546 100644
--- a/erpnext/hr/report/vehicle_expenses/vehicle_expenses.py
+++ b/erpnext/hr/report/vehicle_expenses/vehicle_expenses.py
@@ -9,7 +9,7 @@
 from erpnext.accounts.report.financial_statements import get_period_list
 
 def execute(filters=None):
-	columns, data = [], []
+	columns, data, chart = [], [], []
 	if filters.get('fiscal_year'):
 		company = erpnext.get_default_company()
 		period_list = get_period_list(filters.get('fiscal_year'), filters.get('fiscal_year'),"Monthly", company)