Creates an empty /etc/libuser.conf file, if it doesn't exist, so that
system-config-samba can start (LP: #1387274)

--- a/src/system-config-samba.py
+++ b/src/system-config-samba.py
@@ -41,5 +41,15 @@
 
 os.umask (0022)
 
+# Create an empty /etc/libuser.conf file if it doesn't exist (LP: #1387274)
+try:
+    if not os.path.exists("/etc/libuser.conf"):
+        open("/etc/libuser.conf", "w").close()
+        print("Created the file /etc/libuser.conf")
+except Exception as ex:
+    print("Error creating /etc/libuser.conf: {}".format(ex))
+except:
+    print("Error creating /etc/libuser.conf")
+
 import mainWindow
 mainWindow.MainWindow(debug_flag)