[KiPart BUG] errors out on unnamed pins

[jaskij]

Describe the bug
When a pin has no name, kipart errors on the part and doesn't process it

To Reproduce

kipart test.csv

foo
Pin,Name,Type,Side
1,foo,bidir,left
2,,nc,left

bar
Pin,Name,Type,Side
1,foo,bidir,left
2,x,nc,left

Expected behavior
A working library

Desktop (please complete the following information):

• Arch, a week or two since update
• Python version 3.3.17
• KiPart version 2.1.0