JSON parser: fix String initialization with nullptr
JSON parser: fix String initialization with nullptr

rhomobile/rhodes,rhomobile/rhodes,watusi/rhodes,rhomobile/rhodes,watusi/rhodes,watusi/rhodes,watusi/rhodes,rhomobile/rhodes,rhomobile/rhodes,rhomobile/rhodes,rhomobile/rhodes,watusi/rhodes,watusi/rhodes,watusi/rhodes,rhomobile/rhodes,rhomobile/rhodes,rhomobile/rhodes,watusi/rhodes,watusi/rhodes,watusi/rhodes