ASIdiSPIM: fix runtime exception with getting channel list

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14861 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
ASIdiSPIM: cleaned up comments and removed to-do

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14862 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd