sendChunk (subscriber, chunk) {
    // Skip the chunk that is just [
    if (chunk.length < 2) { return; }

    try { // try to parse and send the chunk
      const json = JSON.parse(chunk);
      subscriber.next(json);
    } catch (err) {
      subscriber.error(`ERROR: ${err}`);
      console.log(`Error parsing this chunk:\n${chunk}`);
    }
  }
Parses JSON and sends the chunk to the subscriber.
Also sends any errors to the subscriber.
Logs JSON parsing errors to the console with the offending JSON.
@param {Object} subscriber - The subscriber to send chunks
@param {String} chunk - The stringified JSON to parse and send to the subscriber