Un-indented comments crash parser

[schuylermartin45]

Comments that do not match the same level of indentation as the section they exist in will crash the parser.

Example:

test:
  imports:
    - can
    - can.interfaces
#    - can.interfaces.etas
#    - can.interfaces.ics_neovi
#    - can.interfaces.ixxat
#    - can.interfaces.kvaser
#    - can.interfaces.neousys
#    - can.interfaces.pcan
#    - can.interfaces.seeedstudio
    - can.interfaces.serial
    - can.interfaces.socketcan
    - can.interfaces.socketcand

(from https://github.com/AnacondaRecipes/python-can-feedstock/blob/main/recipe/meta.yaml)