[9.1] ESQL: Fix NPE on empty to_lower/to_upper call (#131917) #131924
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Apparently, when calling to_lower or to_upper with no parameters, an NPE was thrown, instead of a proper error. AFAICT, this is an old left-over from when these functions were imported from a much older version. Resolves elastic#131913.
GalLalouche
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:Analytics/ES|QL
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Backports the following commits to 9.1: