Bug #17049656 : MYSQLD --LOCAL-SERVICE PARAMETER DOES NOT WORK

Problem: The "--local-install" service does not perform as expected for, at least,
         Windows.

Fix: A NULL pointer was dereferenced due to which there was crash.A check was introduced
     for NULL string before dereferencing it.No test cases written as it is a bug during 
     installation.

sql/mysqld.cc

@@ -4786,7 +4786,7 @@ default_service_handling(char **argv,
 
   /* We have to quote filename if it contains spaces */
   pos= add_quoted_string(path_and_service, file_path, end);
-  if (*extra_opt)
+  if (extra_opt && *extra_opt)
   {
     /* 
      Add option after file_path. There will be zero or one extra option.  It's