Re: 7.2 fe-exec.c patch to PQescapeString()

This patch makes PQescapeString() guard against null input

ptrs and/or length == 0 input.  If any of these occur, the

function returns 0.

*** fe-exec.c.orig    Thu Apr  4 16:06:38 2002
--- fe-exec.c    Thu Apr  4 16:07:30 2002
***************
*** 75,76 ****
--- 75,80 ----

+     if ( ! to || ! from || ! length ) {
+         return 0;
+     }
+
      while (remaining > 0)