gh-142006: Fix HeaderWriteError in email.policy.default caused by extra newline ...

gh-142006: Fix HeaderWriteError in email.policy.default caused by extra newline (#142008)

RDM: This fixes a subtle folding error that showed up when a token exactly filled a line and was followed by whitespace and a token with no folding whitespace that was longer than a line.  In this particular circumstance the whitespace after the first token got pushed on to the next line, and then stolen to go in front of the next unfoldable token...leaving a completely empty line in the line buffer.  That line got turned in to a newline, which is RFC illegal, and the newish security check caught it.  The fix is to just delete that empty line from the buffer.

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>