Toggle() function in <amp-selector> throws exception

[Svenmay]

I just saw that the toggle() function of is throwing an error on every second click.

Console output is:

• Action execution failed: AMP-SELECTOR toggle: Cannot read property 'removeAttribute' of undefined

This also happens on https://ampbyexample.com/components/amp-selector/. On that page go to "Actions" sections and click on "toggle(index=1)" multiple times. Every second click throws the exception in console.

Any other info needed from me? Just let me know :-)

[kul3r4]

@nainar who worked on ampproject/amphtml#13553: is this the expected behaviour? It seems it launches the error when nothing is selected