Investigate why guard-for-in doesn't work for all cases

[lilleyse]

We have the eslint rule

'guard-for-in': 'error'

but it doesn't error on cases like

        for (var subMaterialId in materials) {
            if (shaderComponent.indexOf(subMaterialId) > -1) {
                return true;
            }
        }

which should actually look like:

        var materials = material._template.materials;
        for (var subMaterialId in materials) {
            if (materials.hasOwnProperty(subMaterialId)) {
                if (shaderComponent.indexOf(subMaterialId) > -1) {
                    return true;
                }
            }
        }

It seems like guard-for-in is happy as long as there's an if statement after the for loop but it doesn't actually check with whether hasOwnProperty is called.