Spot: Formatting; remove commented code

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14396 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
Spot: Return null on error getting snapped image

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14397 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd