updated for version 7.3.051
Problem:    Crash when /home/mool/bin:/usr/local/sbin:/usr/local/bin:/home/mool/java/jdk/bin:/bin:/sbin:/usr/bin:/usr/games:/usr/sbin:/usr/X11R6/bin:/usr/local/linux-jdk1.3.1/bin:/usr/local/lib/python2.2/Tools/idle is empty.
Solution:   Check for vim_getenv() returning NULL. (Yasuhiro Matsumoto)
diff --git a/src/version.c b/src/version.c
index 8756e19..24992e7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    51,
+/**/
     50,
 /**/
     49,