how to not display indenline char if there are no 4 spaces

[spaceone]

How can I disable that the indenLine char is shown for space characters starting a new indentation level but does not fit the 4 spaces.

For example:

»   for p in parts:
»   »   i = p.find('=')
»   »i = p.find('=')

line two is correctly indented with 4 spaces, the last line is not (only one space).