Fix problems with nulls in sequence tests #9865
Merged
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Fixes #9856. Sequence tests were not handling the potential of nulls being generated properly. test_sequence_with_step used the data generator to generate a single value but was not prepared to handle a null being generated when formatting the query. Similarly, test_sequence_illegal_boundaries was generating a single value that should be out of bounds, but the single value could be a null value which would not be an out of bounds scenario.