JSON: Fix multi-line string import
JSON: Fix multi-line string import

Necessary following changes in afa27c7 in order for both numeric and string-based array data to be imported as desired.

MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3