Handling nulls, not enough tokens etc on java script side.

[zxcvwrs]

1. Check if the e-mail body is null; drop if yes.
2. (batch) Check duplicates if many e-mails are to be checked; drop if yes.
3. Check if the e-mail body is empty; drop if yes.
4. Check if the e-mail body cannot be decoded (decoding_error).
5. Check if the preprocessed e-mail body is to: "to_manual_extraction."
6. Check if the preprocessed e-mail body is an empty string; drop if yes.