Don't kill itself in --fast-read mode if there is no decompressor started.
Don't kill itself in --fast-read mode if there is no decompressor started.

Reported by:	Gordon Tetlow <gordont@gnf.org>
Submitted by:	tjr
MFC after:	1 week
		(along with other --fast-read changes)

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase