[FIX] investor_wallet_platform_base: limit template search to 1

Author: mclaeysb

investor_wallet_platform_base/models/mail_template.py

@@ -38,7 +38,7 @@ def get_email_template_by_key(self, mail_template_key, structure):
         template_obj = self.env['mail.template']
         mail_template = template_obj.search([
                             ('template_key', '=', mail_template_key),
-                            ('structure', '=', structure.id)])
+                            ('structure', '=', structure.id)], limit=1)
 
         if not mail_template:
             raise ValidationError(