Add error message for invalid concept name
Minor update
Improve error handling in concept creation
Add test case for the poc fixes
Fix build
Revert change
Merge pull request #80 from 28msec/fix-hypercube-legalentity

Fix hypercube legalentity and improved filter behavior
Implement review comments
Merge branch 'master' into poc
Merge pull request #125 from 28msec/poc

POC fixes
Add test for fix #86