feat: add IsEmptyFromPtr / IsNotEmptyFromPtr - #943
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Pointer-aware empty checks: nil pointer is empty; otherwise IsEmpty of the pointed-to value (samber#902). Fixes samber#902
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Summary
#902 requests empty-checks for pointer values.
IsEmptyworks on values; callers with*Twant nil-safe empty detection.Fix
IsEmptyFromPtr[T comparable](x *T) bool— nil ⇒ empty, elseIsEmpty(*x)IsNotEmptyFromPtr— negationTests
Fixes #902