Fix problems with configure mountpoint when auto install:

1. configure root mountpoint ok and and just press Enter when the focus
   on no button, errors occur.

	modified:   text/auto_install.py

text/auto_install.py

@@ -41,11 +41,13 @@ while True :
 		elif list[count] == 'mountpoint':
 			ri_newt.MountPoint()
 		s = ri_newt.Screen.dict[list[count]].set_data()
-
-	if int(s) == 0: 
-		count = count + 1
-	else:
-		count = count - 1 
+        try:
+            if int(s) == 0: 
+                count = count + 1
+            else:
+                count = count - 1 
+	except:
+             pass
 
 	if count < 0 or count > len(list) - 1:
 		try: