The fdc3.open function returns a 'error' string rather than an error

[ColinEberhardt]

If I execute the following:

fdc3.open("NoAppId").catch(e => console.log("type of thrown object", typeof e));

The following is logged:

type of thrown object string

However, the API indicates that:

If opening errors, it returns an Error with a string from the OpenError enumeration.

Note, other containers have this issue too:

InteropIO/finsemble-seed#773