combine consecutive stopifnot calls (#5016)
combine consecutive stopifnot calls (#5016)


vlulla/data.table,jangorecki/data.table,Rdatatable/data.table,Rdatatable/data.table,jangorecki/data.table,vlulla/data.table,jangorecki/data.table,vlulla/data.table,Rdatatable/data.table,vlulla/data.table,Rdatatable/data.table,jangorecki/data.table