Number of processes in multiprocessing mode can become NaN

[founta]

[root@mymachine test]# tessera -m -P 4 -p 8052 -c tessera-config.json
Launching in multiprocess mode with NaN workers.

I was seeing the above output. It was interesting -- it would work on one of my machines but not this one. I had it running in the same docker image across both machines. I am not entirely sure what's up there but I tested that replacing that parseInt for the number of processes with parseFloat or Number corrected the problem

I also saw that doing this (specifying the number of processes twice) fixed the issue on the problematic machine for whatever reason:

[root@mymachine test]# tessera -m -P 4 -P 4 -p 8052 -c tessera-config.json
Launching in multiprocess mode with 4 workers.