Logagent doesn't parse incoming lines in some cases

[gr0]

As described in Charry2014/balena-node-red-raspberry-pi-gpio#1 Logagent fails to parse some lines on Raspberry PI, for example:

{"ip_address":"192.168.88.23","device_name":"summer-haze","device_type":"raspberrypi4-64","application":"Garden","message":"Aug 07 11:29:14 364a735 d970cdcf711a[1379]: 2020-08-07T11:29:14.054Z v3.0.45 pid[8] Memory stats: heapUsedMB=17 heapTotalMB=19 memoryRssMB=64"}

Initially reported by @Charry2014.