TagUtils constructor Null safety

1. baguette
2. TagUtils
3. TagUtils
4. TagUtils constructor

TagUtils class

1. Constructors
2. TagUtils
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static methods
12. isExists
13. showTags