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BUG: fix fill value for gouped sum in case of unobserved categories for string dtype (empty string instead of 0) #50019

BUG: fix fill value for gouped sum in case of unobserved categories for string dtype (empty string instead of 0)

BUG: fix fill value for gouped sum in case of unobserved categories for string dtype (empty string instead of 0) #50019