`fcli tool * install`: Failure when installing to non-empty dir if already registered

[rsenden]

Current Behavior

In this screenshot, first installation to non-empty directory shows expected behavior, with fcli asking the user to confirm cleaning the target directory.

However, once a specific tool version has been registered with fcli (through the first install command in this example), new installation to a different non-empty directory fails with an exception, without giving the user the option to clean the target directory. Same failure is seen if user explicitly passes -y in the install command to auto-confirm any prompts.

Expected Behavior

The fcli tool * install commands should ask for confirmation to clean a non-empty target directory independent of whether that tool version was previously registered (in same or different location).

Steps To Reproduce

See screenshot above

Environment

Anything else?

Likely closely related to #976