system deadlock

[cn_華少]

Line 102 103 in this doc. go causes a system deadlock, mainly because the coroutine implemented above failed to add valid data to the channel

	body := <-bc
	meta := <-mc

err:

ConvertDoc: could not read doc: mscfb: bad signature; 43016997712
wvText: exit status 255

[Andrea Mugellini]

I had the same problem, solved with this: #134

[Jonathan Ingram]

Fixed in #134