Client: Helper function getField to ensure fields in JSON response.
Client: Helper function getField to ensure fields in JSON response.

dropbox/dropbox-sdk-php,TimeDoctorLLC/dropbox-sdk-php,TimeDoctorLLC/dropbox-sdk-php,itsazzad/dropbox-sdk-php,itsazzad/dropbox-sdk-php,dropbox/dropbox-sdk-php,sayfulit/dropbox-sdk-php,demisang/dropbox-sdk-php,sayfulit/dropbox-sdk-php,demisang/dropbox-sdk-php