updated for version 7.4.556
Problem:    Failed commands in Python interface not handled correctly.
Solution:   Restore window and buffer on failure.
diff --git a/src/version.c b/src/version.c
index 0c8b39a..017bff6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    556,
+/**/
     555,
 /**/
     554,