System deadlock - reopen ticket

[tamir-laminar]

I can't re-open tickets, but I noticed a system deadlock bug that was partially handled here:

#112

The bug is when the file is corrupted (or we have some bug in the underline library), and we get panic:

panic when reading doc format: runtime error: slice bounds out of range [:-1]

we are in deadlock (waiting for channel that nothing writes to it).

If you look at the code:

	go func() {
		defer func() {
			if e := recover(); e != nil {
				log.Printf("panic when reading doc format: %v", e)
			}
		}()

in the case of panic we don't write to mc channel, casing a dead lock.