vt-tv crashes when built with Debug

[pierrepebay]

With the default configuration, a nlohmann/json assertion fails and crashes vt-tv:

Input configuration file=/home/pierrelp/Develop/NGA/DARMA/vttv/vt-tv/config/conf.yaml
Reading file for rank 1
INFO - json_datafile_validator.py:400 - Validating file: /home/pierrelp/Develop/NGA/DARMA/vttv/vt-tv/data/lb_test_data/data.1.json
INFO - json_datafile_validator.py:414 - Valid JSON schema in /home/pierrelp/Develop/NGA/DARMA/vttv/vt-tv/data/lb_test_data/data.1.json
vt-tv_standalone: /home/pierrelp/Develop/NGA/DARMA/vttv/vt-tv/lib/json/include/nlohmann/json.hpp:3730: const nlohmann::vt::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType>::value_type& nlohmann::vt::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer, BinaryType>::operator[](T*) const [with T = const char; ObjectType = std::map; ArrayType = std::vector; StringType = std::__cxx11::basic_string<char>; BooleanType = bool; NumberIntegerType = long int; NumberUnsignedType = long unsigned int; NumberFloatType = double; AllocatorType = std::allocator; JSONSerializer = nlohmann::vt::adl_serializer; BinaryType = std::vector<unsigned char>; const_reference = const nlohmann::vt::basic_json<>&]: Assertion `m_value.object->find(key) != m_value.object->end()' failed.
Aborted (core dumped)