String input "all", followed by quickly changing query breaks search bar

When I enter the string "all" into the search bar on https://api.emberjs.com/ember/release, I see a console error logged:
```
Unhandled Promise Rejection: TypeError: undefined is not an object (evaluating 'this.get("result.module").includes')
```

After this error occurs, the search feature becomes unresponsive (so backing out "all" and then entering a new query string shows the old results).