Filtering tags fails on submodels

[miketriana]

Attempting to apply filters or any options that look at the tags of a model seems to fail in the context of submodels. Here I try using submodels to make different characters in a sentence speak consistently:

const Improv = require('improv');

const spec = {
    name: {
        bind: true,
        groups: [
            {
                tags: [['nationality', 'spanish']],
                phrases: ['Carmen', 'Miguel', 'Jose']
            },
            {
                tags: [['nationality', 'french']],
                phrases: ['Guy', 'Pierre', 'Wes']
            }
        ]
    },
    say_hello: {
        groups: [
            {
                tags: [['nationality', 'spanish']],
                phrases: ['[:name] says "Hola!"']
            },
            {
                tags: [['nationality', 'french']],
                phrases: ['[:name] says "Bonjour!"']
            }
        ]
    },
    root: {
        groups: [
            {
                tags: [],
                phrases: [
                    '[>actorA:name] walks up to [>actorB:name]. [>actorA:say_hello] and [>actorB:say_hello].'
                ]
            }
        ]
    }
};

const improv = new Improv(spec, {
    filters: [Improv.filters.mismatchFilter()],
    reincorporate: true
});

const myModel = {};

const text = improv.gen('root', myModel);

console.log(myModel);
console.log(text);

Running this results in the following error:

G:\Code\textgen\node_modules\improv\dist\filters.js:41
    var matched = model.tags.find(function (modelTag) {
                             ^

TypeError: Cannot read property 'find' of undefined
    at G:\Code\textgen\node_modules\←[4mimprov←[24m\dist\filters.js:41:30
    at Array.find (<anonymous>)
    at Improv.mismatchFilterSub (G:\Code\textgen\node_modules\←[4mimprov←[24m\dist\filters.js:39:27)
    at Improv.applyFilterToGroup (G:\Code\textgen\node_modules\←[4mimprov←[24m\dist\index.js:191:27)
    at Array.forEach (<anonymous>)
    at Improv.applyFiltersToGroup (G:\Code\textgen\node_modules\←[4mimprov←[24m\dist\index.js:210:20)
    at G:\Code\textgen\node_modules\←[4mimprov←[24m\dist\index.js:232:22
    at Array.map (<anonymous>)
    at Improv.applyFilters (G:\Code\textgen\node_modules\←[4mimprov←[24m\dist\index.js:231:21)
    at Improv.__gen (G:\Code\textgen\node_modules\←[4mimprov←[24m\dist\index.js:83:66)

I tried putting a console.log in the filter function and it seems to think model is a string for some reason instead of an object.