[BUG] Inner Label in OFF State appears in ON State when ON State is Empty

[aworld1]

Environment

• Package version(s): 6.3.2
• Operating System: MacOS
• Browser name and version: Island, latest

Code Sandbox

Testable by adding simply:

<Switch
    {...switchProps}
    labelElement={"Bug Test: Only ON label"}
    innerLabelChecked="on"
    innerLabel=""
/>
<Switch
    {...switchProps}
    labelElement={"Bug Test: Only OFF label"}
    innerLabelChecked=""
    innerLabel="off"
/>

Steps to reproduce

1. Give a switch an off inner label
2. Leave its on inner label blank
3. Turn it on and off, notice the label is present for both
4. Do the reverse (label for on only) and notice it's only present in the on state

Actual behavior

Label is present in both on and off state, even when just specified in off state

Expected behavior

Should only appear for specified state

Proof of issue

[mm-wang]

Per the documentation, https://blueprintjs.com/docs/#core/components/switch.props-interface, when innerLabelChecked is not provided but innerLabel is, then innerLabel is used for both cases. So this is intended behavior, however, I can see the confusion and it would be reasonable to have a feature request for something akin to "innerLabelUnchecked" to be really explicit.