[gnome-software] details page: Hide fallback screenshot for fonts that have screenshots

[Kalev Lember <klember src gnome org>]

commit 0915f92e16e0a1da4fbd5e842cd6d45054c21f82
Author: Kalev Lember <klember redhat com>
Date:   Wed Jan 17 21:38:25 2018 +0100

    details page: Hide fallback screenshot for fonts that have screenshots
    
    Otherwise we end up showing the fallback screenshot (saying "No
    screenshots provided") directly below the font screenshots.

 src/gs-details-page.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/gs-details-page.c b/src/gs-details-page.c
index 724cab6..f6c5f2a 100644
--- a/src/gs-details-page.c
+++ b/src/gs-details-page.c
@@ -609,6 +609,8 @@ gs_details_page_refresh_screenshots (GsDetailsPage *self)
                        gtk_box_pack_start (GTK_BOX (self->box_details_screenshot_main), ssimg, FALSE, FALSE, 
0);
                        gtk_widget_set_visible (ssimg, TRUE);
                }
+               gtk_widget_set_visible (self->box_details_screenshot_fallback,
+                                       screenshots->len == 0);
                return;
        }