[IMP] account: set default vendor_display_name for uploads

Previously a default name was set only for vendor bills created from
emails.

Task: 1893079

addons/account/models/account_invoice.py

@@ -381,10 +381,15 @@ class AccountInvoice(models.Model):
     def _get_vendor_display_info(self):
         for invoice in self:
             vendor_display_name = invoice.partner_id.name
-            if not vendor_display_name and invoice.source_email:
-                vendor_display_name = _('From: ') + invoice.source_email
+            invoice.invoice_icon = ''
+            if not vendor_display_name:
+                if invoice.source_email:
+                    vendor_display_name = _('From: ') + invoice.source_email
+                    invoice.invoice_icon = '@'
+                else:
+                    vendor_display_name = ('Created by: ') + invoice.create_uid.name
+                    invoice.invoice_icon = '#'
             invoice.vendor_display_name = vendor_display_name
-            invoice.invoice_icon = invoice.source_email and '@' or ''
 
     @api.multi
     def _get_computed_reference(self):