Fix SIGINFO handling: do not print incorrect timing statistics when the data for it is not available.
Fix SIGINFO handling: do not print incorrect timing statistics
when the data for it is not available.

Founded by:	ping -s0 localhost; press ^T

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase