[evolution] I#917 - Crash under html_editor_update_actions

[Milan Crha <mcrha src gnome org>]

commit 1612f38e670a234987eba7f773aade83def24baf
Author: Milan Crha <mcrha redhat com>
Date:   Mon May 11 18:30:48 2020 +0200

    I#917 - Crash under html_editor_update_actions
    
    Closes https://gitlab.gnome.org/GNOME/evolution/-/issues/917

 src/e-util/e-html-editor.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/src/e-util/e-html-editor.c b/src/e-util/e-html-editor.c
index bb0c998ec1..14bdd19f36 100644
--- a/src/e-util/e-html-editor.c
+++ b/src/e-util/e-html-editor.c
@@ -318,8 +318,11 @@ html_editor_inline_spelling_suggestions (EHTMLEditor *editor,
                 *     child of the proxy widget. */
                gtk_ui_manager_ensure_update (manager);
                proxies = gtk_action_get_proxies (action);
-               child = gtk_bin_get_child (proxies->data);
-               g_object_set (child, "use-markup", TRUE, NULL);
+
+               if (proxies) {
+                       child = gtk_bin_get_child (proxies->data);
+                       g_object_set (child, "use-markup", TRUE, NULL);
+               }
 
                g_free (action_name);
                g_free (action_label);