Fix issue when df is empty for diff (core-run, core-swit) Remove group bars due to out of order bars in group and replace with flat bars
Fix issue when df is empty for diff (core-run, core-swit)
Remove group bars due to out of order bars in group and replace with flat bars

cisco-oss-eng/perfwhiz,cisco-oss-eng/perftools,cisco-oss-eng/perfwhiz,cisco-oss-eng/perftools,cisco-oss-eng/perftools,cisco-oss-eng/perfwhiz