[16.0][FIX] account_budget_oca: fix operation error _compute_practical_amount

Author: polqubiq

account_budget_oca/models/account_budget.py

@@ -151,7 +151,7 @@ def _compute_practical_amount(self):
             acc_ids = line.general_budget_id.account_ids.ids
             date_to = line.date_to
             date_from = line.date_from
-            if line.analytic_account_id.id:
+            if line.analytic_account_id.id and date_from and date_to:
                 self.env.cr.execute(
                     """
                     SELECT SUM(amount)