Merge pull request #934 from expsa/project_test

Update project_invoice.py

odex25_project/project_base/models/project_invoice.py

@@ -355,8 +355,12 @@ class ProjectInvoiceLine(models.Model):
         :param optional_values: any parameter that should be added to the returned invoice line
         """
         self.ensure_one()
-        res = {
-            'name': self.name+'/'+self.project_invoice_id.project_id.name,
+        # Convert to string to avoid TypeError
+        name = str(self.name) if self.name else ''
+        project_name = str(self.project_invoice_id.project_id.name) if self.project_invoice_id and self.project_invoice_id.project_id.name else ''
+    
+    res = {
+            'name': name + '/' + project_name,
             'account_id': self.project_invoice_id.project_id.category_id.account_id and  self.project_invoice_id.project_id.category_id.account_id.id or False,
             'product_id': self.product_id.id,
             'product_uom_id': self.product_uom.id,