masshunter quant 10.1 query


i want to change our query *.linq.qry and i looking for this *.IsMatrixSpikePercentRecoveryNull(), but i have a problem as long as my analyte is as peak not found ,query does not see it as null, can some one tell me how can i write this pls? Things like string.IsNullOrEmpty() does not work.

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