fix(ct): fix issue #148 - It is possible to save Concept without Title and Description
fix(ct): fix issue #148 - It is possible to save Concept without Title and Description

Changes:
- add extra validation for `title` and `text` fields

cjlee112/socraticqs2,cjlee112/socraticqs2,cjlee112/socraticqs2,cjlee112/socraticqs2