Minor fix in condition check, related to #1443 fix.
Minor fix in condition check, related to #1443 fix.

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