sloc aborts (with 0 exit code) if it encounters symbolic link to a nonexistent path

```
$ sloc whatever-directory
Error: Error: ENOENT: no such file or directory, stat '/whatever-directory/whatever-file',Error: ENOENT: no such file or directory, stat '/whatever-directory/whatever-file'
$ echo $?
0

Reproduce the issue by running `sloc whatever-directory` against a symbolic link to a nonexistent path and check the reported error and exit code. Trace how the CLI handles the failed `stat` operation; done means the command no longer aborts unexpectedly and returns an appropriate result for the broken link.

Written by the indexing model from the issue text.