[gnome-flashback] system-indicators: avoid critical warning

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 914819bccd69bd22792311246e5a12f3158845df
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Mon Dec 23 14:51:26 2019 +0200

    system-indicators: avoid critical warning

 system-indicators/si-input-source.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/system-indicators/si-input-source.c b/system-indicators/si-input-source.c
index d9d0b9a..138c07c 100644
--- a/system-indicators/si-input-source.c
+++ b/system-indicators/si-input-source.c
@@ -412,6 +412,9 @@ update_icon (SiInputSource *self)
 {
   gboolean use_ibus_icon;
 
+  if (self->icon_text == NULL && self->icon_file == NULL)
+    return;
+
   use_ibus_icon = g_settings_get_boolean (self->settings,
                                           "use-ibus-icon-if-available");