Use an empty array instead of null
#1980
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Fixes PowerShell#1959 The code on the client expects DefaultChoices to never be `null`. If you send `null`, it tries to access the property `length` on what would be an array.
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Fixes #1959
The code on the client expects
DefaultChoicesto never benull. If you sendnull, it tries to access the propertylengthon what would be an array.