Dicom seg shows all labels as color red

[AHarouni]

Describe the bug
When creating a dicom seg object all segments show up as red unless labels are in the
https://github.com/Project-MONAI/MONAILabel/blob/main/monailabel/datastore/utils/colors.py

Expected behavior
Each segment should have different color

Proposed fix
https://github.com/Project-MONAI/MONAILabel/blob/main/monailabel/datastore/utils/convert.py#L98
change to

out side the loop do 
GENERIC_ANATOMY_COLORS_list = list(GENERIC_ANATOMY_COLORS.values())

        if name in GENERIC_ANATOMY_COLORS:
            rgb = list(info.get("color", GENERIC_ANATOMY_COLORS.get(name, (255, 0, 0))))[0:3]
        else:
            rgb = GENERIC_ANATOMY_COLORS_list[(i%len(GENERIC_ANATOMY_COLORS_list))+1] # picks index from list skipping the background 

[SachidanandAlle]

In case of missing, better to pick a (uniform) random color. Is your proposal the same?

I see it's based on the index. Make sure it's lesser than the total array size

[AHarouni]

I basically am suggesting getting different colors. Having a uniform color would alert the user that the label names are not in the standard list. This is ok only if we provide a way to load his own list with colors.

For simplicity I was proposing just pick random colors. And you are correct, I edited the code by adding a mod for the len of the list.