Fix illegal read in do_is_ordered #261
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do_is_ordered tries to check whether the first element of the series is NA. It needs to first check whether the series has at least one element to avoid reading an uninitialised value. Fixes joshuaulrich#236.
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do_is_ordered tries to check whether the first element of the series
is NA. It needs to first check whether the series has at least one
element to avoid reading an uninitialised value.
Fixes #236.