Since version 0.16.5, th following code returns a null worksheet:
XLSX.utils.json_to_sheet([], {header: columns})

Is it now working as it is wanted? If so, how could we create an empty worksheet? In my case it is expected that sometimes the data is an empty array. And an empty worksheet only with headers is expected.

Issue details

Tooltips broken on Android. They do not show but cause an exception instead.
Also referenced in #4921

Reproduction steps/code

Run the UITest on android (i used a Huawei P8, Android 5)

Version of LibGDX and/or relevant dependencies

1.9.6

Stacktrace

10-12 18:23:17.610 571-761/com.badlogic.gdx.tests.android W/System.err: java.lang.NullPointerE

Not a single form field has a label. These designs are not usable and the patterns presented should be discouraged.

I suggest adding a validation check like Nu Validator, aXe, lighthouse, etc. to show all the places this markup is invalid.