[gimp] app: don't warn in gimp_action_history_action_activated()

[Michael Natterer <mitch src gnome org>]

commit 87b1a2745973ce688edfc9dd39ac6db46fa2763e
Author: Michael Natterer <mitch gimp org>
Date:   Thu Jul 4 17:04:33 2019 +0200

    app: don't warn in gimp_action_history_action_activated()
    
    if there is no "gimp". Happened after the action changes when invoking
    the "quit" action.

 app/widgets/gimpaction-history.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/app/widgets/gimpaction-history.c b/app/widgets/gimpaction-history.c
index 4a24f94fe2..37cdc0341a 100644
--- a/app/widgets/gimpaction-history.c
+++ b/app/widgets/gimpaction-history.c
@@ -359,7 +359,11 @@ gimp_action_history_action_activated (GimpAction *action)
   GList                 *link;
   GimpActionHistoryItem *item;
 
-  g_return_if_fail (history.gimp != NULL);
+  /* Silently return when called at the wrong time, like when the
+   * activated action was "quit" and the history is already gone.
+   */
+  if (! history.gimp)
+    return;
 
   config = GIMP_GUI_CONFIG (history.gimp->config);