Describe the bug
Printing a Vector containing nulls results in a NPE

To Reproduce
Steps to reproduce the behavior:
Create a Vector with null values = Vector.of(String[]{null});
Print it to console (call toString())
Results in NPE

Expected behavior
A clear and concise description of what you expected to happen.
Print [null]

Screenshots / test / examples
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Additional context
Add any other context about the problem here.