mate-xapp-status-applet.py: Don't use theme.has_icon() - not all

usable icons are in themes.

Icon files in /usr/share/xpm will not show up in theme.has_icon(),
but will still be found when creating a GtkThemedIcon (or otherwise
using the icon name).

There's not much point in this check anyhow - if the icon really
doesn't exist, there will still be a fallback icon shown.

Fixes linuxmint/mint-x-icons#209.

Author: mtwebster

status-applets/mate/mate-xapp-status-applet.py

@@ -197,9 +197,8 @@ def set_icon(self, string):
                     icon = Gio.FileIcon.new(icon_file)
                     self.image.set_from_gicon(icon, Gtk.IconSize.MENU)
                 else:
-                    if self.theme.has_icon(string):
-                        icon = Gio.ThemedIcon.new(string)
-                        self.image.set_from_gicon(icon, Gtk.IconSize.MENU)
+                    icon = Gio.ThemedIcon.new(string)
+                    self.image.set_from_gicon(icon, Gtk.IconSize.MENU)
 
                 fallback = False
             except GLib.Error as e: