[Improvement] Prevent potential null pointer error in MetadataObjectStatisticsOperations.java

[justinmclean]

What would you like to be improved?

Added validate to MetadataObjectStatisticsOperations.java dropStatistics method to throw a clear error when the caller supplies a null or empty statistics list, preventing a NullPointerExceptions.

Adding a few lines to the existing test shows the issue:

 private void testDropStatistics(SupportsStatistics supportsStatistics, String path)
      throws JsonProcessingException {
    Assertions.assertThrows(
        IllegalArgumentException.class, () -> supportsStatistics.dropStatistics(null));
    Assertions.assertThrows(
        IllegalArgumentException.class, () -> supportsStatistics.dropStatistics(Collections.emptyList()));

How should we improve?

see above

[Pikady]

Hi! @justinmclean Can I take this issue?

[justinmclean]

Sure it's all yours. If you have any questions, just ask.