[gimp] app: even for fallback icons, it is better to check lookup success.

[Jehan <jehanp src gnome org>]

commit 877c20f420749aa30d4a144823f2c167d129784e
Author: Jehan <jehan girinstud io>
Date:   Sun Jun 24 17:27:36 2018 +0200

    app: even for fallback icons, it is better to check lookup success.

 app/widgets/gimpwidgets-utils.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)
---
diff --git a/app/widgets/gimpwidgets-utils.c b/app/widgets/gimpwidgets-utils.c
index 900838532f..f2a9084d1f 100644
--- a/app/widgets/gimpwidgets-utils.c
+++ b/app/widgets/gimpwidgets-utils.c
@@ -372,9 +372,10 @@ gimp_widget_load_icon (GtkWidget   *widget,
                                                         size, scale_factor,
                                                         GTK_ICON_LOOKUP_GENERIC_FALLBACK);
 
-      pixbuf = gtk_icon_info_load_symbolic_for_context (icon_info,
-                                                        gtk_widget_get_style_context (widget),
-                                                        NULL, NULL);
+      if (icon_info)
+        pixbuf = gtk_icon_info_load_symbolic_for_context (icon_info,
+                                                          gtk_widget_get_style_context (widget),
+                                                          NULL, NULL);
     }
   else
     {
@@ -398,9 +399,10 @@ gimp_widget_load_icon (GtkWidget   *widget,
                                                             size, scale_factor,
                                                             GTK_ICON_LOOKUP_GENERIC_FALLBACK);
 
-          pixbuf = gtk_icon_info_load_symbolic_for_context (icon_info,
-                                                            gtk_widget_get_style_context (widget),
-                                                            NULL, NULL);
+          if (icon_info)
+            pixbuf = gtk_icon_info_load_symbolic_for_context (icon_info,
+                                                              gtk_widget_get_style_context (widget),
+                                                              NULL, NULL);
         }
     }