Practical experience - won't connect

[FilipDominec]

Dear Kaixiang, thank you for your effort making Thorlabs servos work on Linux. However, I tried the current version and it needed some fixes.

1. Originally, the library won't connect to my Thorlabs TDC001 controller, aborting with a message 'Manufacturer unknown, skipping'.

I could fix this by commenting out the raise command after

if not (dev.manufacturer == 'Thorlabs' or dev.manufacturer == 'FTDI'):
### raise Exception('No manufacturer found')
continue ### ... to a next device in the list

in stage/motor_ini.py. Obviously it found my USB webcam first, and it gave up too early.

This is actually fixed in very similar code at UniNE-CHYN/thorpy@e8f000b