High CPU usage on Windows when crow is not connected

[trentgill]

When instantiating a [crow] object on Windows 10, Max will jump to a high CPU usage if there is no crow device attached.

The Max window repeatedly prints "serial * error reading from serial buffer".

It seems that banging the input of the serial object when there is no connected device hasn't different behaviour on mac vs windows. The high cpu usage is likely caused by the prints to the Max window, rather than an underlying issue in the serial port handling.