[FIX] mass_mailing: Create campaign from opportunities

Issue

    - Open any opportunity
    - Go to "Extra Information" and click on "Campaign" field
    - try to create new campaign

    Traceback is raised

Cause

    "self.ids" is empty and the "tuple(self.ids)" on the SQL query return "()"

Solution

    Initialize campaign field with default values

opw-2376082

closes odoo/odoo#61476

X-original-commit: 5797be02e32e68e0a188bfdc8b85068fb8fa5435
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>
Signed-off-by: Achraf <abz-odoo@users.noreply.github.com>

addons/mass_mailing/models/utm.py

@@ -34,6 +34,15 @@ class UtmCampaign(models.Model):
 
     def _compute_statistics(self):
         """ Compute statistics of the mass mailing campaign """
+        default_vals = {
+            'received_ratio': 0,
+            'opened_ratio': 0,
+            'replied_ratio': 0,
+            'bounced_ratio': 0
+        }
+        if not self.ids:
+            self.update(default_vals)
+            return
         self.env.cr.execute("""
             SELECT
                 c.id as campaign_id,
@@ -64,12 +73,7 @@ class UtmCampaign(models.Model):
         for campaign in self:
             stats = stats_per_campaign.get(campaign.id)
             if not stats:
-                vals = {
-                    'received_ratio': 0,
-                    'opened_ratio': 0,
-                    'replied_ratio': 0,
-                    'bounced_ratio': 0
-                }
+                vals = default_vals
             else:
                 total = (stats['expected'] - stats['ignored']) or 1
                 delivered = stats['sent'] - stats['bounced']