Fix subsetting axis with single value #1383
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Description of Changes
Fixes Unidata/tds#532.
isAscendingshould return true for any positiveresolution, including 0 (which is the resolution of an axis with a single value). This condition is used to determine whether min/max indexes should get flipped when a subset is requested, which currently results in an error for the case of an axis with a single value.