[FIX] account: fix a division by zero in automatic entries

When opening automatic entries on a group of entries which sum equals to
zero, a division by zero occurs which cause a traceback.

This commit will fix the issue.

task id #2334872

X-original-commit: bd8b81c62c4256898d579f81f066ad202f4ea79a

addons/account/wizard/account_automatic_entry_wizard.py

@@ -49,7 +49,6 @@ class AutomaticEntryWizard(models.TransientModel):
             if not (0.0 < record.percentage <= 100.0):
                 raise UserError(_("Percentage must be between 0 and 100"))
             if record.percentage != 100 and record.action != 'change_period':
-                print(record.percentage)
                 raise UserError(_("Percentage can only be set for Change Period method"))
 
     @api.depends('percentage', 'move_line_ids')
@@ -60,7 +59,11 @@ class AutomaticEntryWizard(models.TransientModel):
     @api.depends('total_amount', 'move_line_ids')
     def _compute_percentage(self):
         for record in self:
-            record.percentage = record.total_amount / (sum(record.move_line_ids.mapped('balance')) or record.total_amount) * 100
+            total = (sum(record.move_line_ids.mapped('balance')) or record.total_amount)
+            if total != 0:
+                record.percentage = (record.total_amount / total) * 100
+            else:
+                record.percentage = 100
 
     @api.depends('move_line_ids')
     def _compute_account_type(self):