id is not populated for radio boolean fields

[epicfaace]

Description

ID is not populated for radio boolean fields.

Steps to Reproduce

Playground example

Expected behavior

I expect there to be an element (i.e. field-radio-group) to have id equal to "root", rendering the following markup:

<div class="form-group field field-boolean">
    <div class="">
        <div class="">
            <div></div>
            <div></div>
            <div class="field-radio-group" id="root">
                <div class="radio "><label><span><input type="radio" name="0.5118129510759399" value="true"><span>yes</span></span></label></div>
                <div class="radio "><label><span><input type="radio" name="0.5118129510759399" value="false"><span>no</span></span></label></div>
            </div>
            <div></div>
            <div></div>
        </div>
        <div class="col-xs-2"></div>
    </div>
</div>

Actual behavior

<div class="form-group field field-boolean">
    <div class="">
        <div class="">
            <div></div>
            <div></div>
            <div class="field-radio-group">
                <div class="radio "><label><span><input type="radio" name="0.5118129510759399" value="true"><span>yes</span></span></label></div>
                <div class="radio "><label><span><input type="radio" name="0.5118129510759399" value="false"><span>no</span></span></label></div>
            </div>
            <div></div>
            <div></div>
        </div>
        <div class="col-xs-2"></div>
    </div>
</div>

Version

1.2.0