Adjust categories tags
Do not allow the field point of quizzes to null data. So we auto set it to "0" when user leave it blank to null in such field.
Merge pull request #101 from not001praween001/adjust-categories-tags

Adjust categories tags
Merge pull request #102 from not001praween001/do-not-leave-the-point-blank

Do not leave the quiz point(score) blank