Fixed storing and loading nulls and booleans in Redis

See #1311 

- [ ] Fix `LuaScriptBuilder` to use `HEXISTS` in case of `null` values instead of comparison.
- [x] Fix `LuaScriptBuilder` to cast booleans to 0 or 1 before using these in conditions.
This is an insert so the Key does not exist before. in Line 137 you SET all the keys that are not null. So in line 141 they are not there so the delete is not necessary.