Bad characters in subject (aka title)

I found a few items in my JSON that included characters XML doesn't like including newlines and ampersands. I resolved it as follows:

Add to imports:
from xml.sax.saxutils import escape
import re

Change subject to:
subject = escape(re.sub(' +',' ',re.sub('\n',' ',s["title"]))).rstrip().encode(char_encoding, 'replace')

The escape helps find ampersands, etc, then the nested re.sub replaces newlines and multiple spaces. Finally an rstrip to clean trailing spaces for neatness.

Locate the exporter code that constructs the subject from s["title"], then review how the XML subject is encoded. Verify that titles with newlines, repeated spaces, ampersands, and other XML-sensitive characters produce a cleaned, valid subject without trailing spaces.

Written by the indexing model from the issue text.