CLI new_card() does not support image type

[CocoaMix86]

This is due to a missing implementation in file construction.cpp.
This block doesn't handle the Image type at all and just goes straight to the ELSE statement, which throws the error.

[TomTkacz]

I issued a PR on the fork of MSE2 by @haganbmj to fix this issue (since this repo rarely merges PRs anymore). Someone could open a PR here in the future with the same code to fix the issue if needed.