Fix an issue when there are no history data for a checksum
Fix an issue when there are no history data for a checksum

kormoc/Query-Digest-UI,qbdsoft/Query-Digest-UI,kormoc/Query-Digest-UI,qbdsoft/Query-Digest-UI,qbdsoft/Query-Digest-UI,qbdsoft/Query-Digest-UI,kormoc/Query-Digest-UI