Hold off on reading from a log file if it does not yet exist

I was running into issues when testing on 1.2.11.

Error:
IOError: [Errno 2] No such file or directory: '/var/folders/mh/h_jxf_b943x5tl9kv_hf2j3h0000gn/T/1383353300531-0/test/node1/logs/system.log'