SSL: fixed $ssl_session_id possible segfault after 97e3769637a7.

Even during execution of a request it is possible that there will be
no session available, notably in case of renegotiation.  As a result
logging of $ssl_session_id in some cases caused NULL pointer dereference
after revision 97e3769637a7 (1.5.9).  The check added returns an empty
string if there is no session available.
1 file changed
tree: dec3e862570aa0a1c58cf1dceb0a2c3d13a0cb71
  1. auto/
  2. conf/
  3. contrib/
  4. docs/
  5. misc/
  6. src/
  7. .hgtags