1.7.0

• #189 Add option to export root document if no sub-document exists
  • This option can be invoked via the --export-root-if-no-subdocument command line argument
  • When the root document expression of an export refers to a sub-document or list of sub-documents the all source expressions will be evaluated against the sub-document unless prefixed with $. in which case they refer to the root document. In cases where it is desirable to have a row exported even if the sub-document does not exist the --export-root-if-no-subdocument can be used. When this happens only root document expressions (prefixed with $.) will be evaluated. All other expressions will yield a blank value.