fix parsing desktop files for icons dialog

src/icons.c

@@ -328,6 +328,8 @@ parse_desktop_file (gchar * filename)
           if (type == TYPE_APP)
             {
               ent->command = g_key_file_get_string (kf, "Desktop Entry", "Exec", NULL);
+              if (ent->command)
+                {
                   /* remove possible arguments patterns */
                   for (i = strlen (ent->command); i > 0; i--)
                     {
@@ -339,6 +341,7 @@ parse_desktop_file (gchar * filename)
                     }
                   ent->in_term = g_key_file_get_boolean (kf, "Desktop Entry", "Terminal", NULL);
                 }
+            }
           else
             {
               gchar *url = g_key_file_get_string (kf, "Desktop Entry", "URL", NULL);