style(CLI): improve error message when drive doesn't exist anymore (#1222)
style(CLI): improve error message when drive doesn't exist anymore (#1222)

The current message is short and unfriendly.

Fixes: https://github.com/resin-io/etcher/issues/1125
Signed-off-by: Juan Cruz Viotti <4148f5869aa1bcd7efd85b513a5874967e585032@openmailbox.org>
resin-io/etcher,resin-io/resin-etcher,resin-io/resin-etcher,resin-io/etcher,resin-io/herostratus,resin-io/herostratus,resin-io/etcher,resin-io/etcher,resin-io/etcher