non-zero exit code on errors

[eadmaster]

From jq manpage:

       ·   -e / --exit-status:

           Sets the exit status of jq to 0 if the last output values was neither false nor  null,
           1  if the last output value was either false or null, or 4 if no valid result was ever
           produced. Normally jq exits with 2 if there was any usage problem or system  error,  3
           if there was a jq program compile error, or 0 if the jq program ran.