[deploy directory] Don't return error code when folder doesn't contain a file with a matching pattern

avoid crash when folder doesn't contain a file with a matching pattern:

```
$ bump deploy --auto-create --hub "test-hub" --token $BUMPSH_TOKEN --filename-pattern "{slug}-api" "test-case"
> Error: No documentation found in test-case
```

This returns a non 0 error code where as its not really an error from the CLI.

Start by tracing the `bump deploy` command and its `--filename-pattern` handling for the no-matching-file case. Run the command shown in the issue and verify that a folder without a matching file does not crash or return a non-zero exit code.

Written by the indexing model from the issue text.