fix: missingKeyLogger case

[fee-pg]

What is the purpose of this pull request? (put an "X" next to item)

[ ] Documentation update
[X] Bug fix
[ ] New feature
[ ] Other, please explain:

What changes did you make? (Give an overview)

1. background
   If the key value is a symbol sentence, it will be warned missing key, and then there are in my file, which makes me confused.
2. reason
   it returns undefined in getDicValue function because conflicting with the key separator semantically
3. this pr :)

unit tests passed.