Save account configurations from flags even if no command is provided

[zimeg]

Summary

If no command is provided, the help output will be shown. This includes a flag only invocation.

Example:

$ ./etime --username="[email protected]" --password="hunter2"
# The help output is output here

Proposed enhancement

If the username/password or device is provided by flags, these should be stored in configs. But etime should still gracefully exit before attempting to run the missing command.