=IFERROR(VLOOKUP(A1,table,2,FALSE),"Not found")
=IFNA(VLOOKUP(A1,table,2,FALSE),"Not found")
=IFERROR(VLOOKUP(A1,table,2,FALSE),"")
=IFERROR(VLOOKUP(A1,table,2,FALSE),"Not found")
=IF(ISNA(VLOOKUP(A1,table,2,FALSE)),"",VLOOKUP(A1,table,2,FALSE))