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.

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 6.2.2
• Cross-platform modules: 6.0.1
• Android Runtime: 6.2.0
• iOS Runtime: 6.2.0
• Plugin(s): unrelated

Describe the bug
openFile method of utils module does not preview the

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