[gnome-control-center/gnome-3-24] printers: Fix visibility guard for the printer "Model" label

[Felipe Borges <felipeborges src gnome org>]

commit 2bebdf11b593481d7d54362254f8f32a2e362e9d
Author: Felipe Borges <felipeborges gnome org>
Date:   Thu Jul 20 13:32:14 2017 +0200

    printers: Fix visibility guard for the printer "Model" label
    
    We just present the printer "Model" when printer_make_and_model
    is different than NULL OR not an empty string.
    
    We were using the wrong logic operator in the conditional that
    toggles the visibility of this info.

 panels/printers/pp-printer-entry.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/panels/printers/pp-printer-entry.c b/panels/printers/pp-printer-entry.c
index 4823924..7efa3bf 100644
--- a/panels/printers/pp-printer-entry.c
+++ b/panels/printers/pp-printer-entry.c
@@ -761,7 +761,7 @@ pp_printer_entry_new (cups_dest_t  printer,
 
   self->printer_make_and_model = sanitize_printer_model (printer_make_and_model);
 
-  if (self->printer_make_and_model == NULL && self->printer_make_and_model[0] != '\0')
+  if (self->printer_make_and_model == NULL || self->printer_make_and_model[0] != '\0')
     {
       gtk_widget_hide (GTK_WIDGET (self->printer_model_label));
       gtk_widget_hide (GTK_WIDGET (self->printer_model));