commit messages that don't include the Component are parsed incorrectly

For example: 

A commit message:
```
feat: adds new foomaker function
```

Is parsed as:

```
❯ unchain parse
hash,semver,type,component,description,body,footer
5b4f46603bfb957aff16e581f9cd66905694a3b4,patch,fea,t,adds new foomaker function,,
```

