simdoc: only unpack read result if there is data
Merge branch 'master' of github.com:reverbrain/wookie

Conflicts:
	test/elliptics_load_docs.cpp
Merge branch 'master' of github.com:reverbrain/wookie
Merge branch 'master' of github.com:reverbrain/wookie
Merge branch 'master' of github.com:reverbrain/wookie
Merge branch 'master' of github.com:reverbrain/wookie
Merge branch 'master' of github.com:reverbrain/wookie
Merge branch 'master' of github.com:reverbrain/wookie
Merge branch 'master' of github.com:reverbrain/wookie
Merge branch 'master' of github.com:reverbrain/wookie
Merge branch 'master' of github.com:reverbrain/wookie