Parser.HTML crashes on feed(0)

Imported from http://bugzilla.roxen.com/bugzilla/show_bug.cgi?id=1031

Reported by Thomas Bopp, Uni-GH Paderborn astra@upb.de

I tried just p->feed(0) in a testprogram and it did not crash, on my large project I got the following:

Fatal error
at /home/peter/hack/newdeal/build/pike.sol2.5.1/build/../pike/src/modules/P
arser/html.c:1332
internal error: tail not found in feed (put_out_feed_range)
Attempting to dump backlog (may fail).
Parser.HTML: feed(0)
server/server.pike:116: read_configs()

It happens with my source xml file and there is no newline in the last line of source.