Fix: reading on input, input length check was wrong. Now outputs -9999 if, and only if, the line is empty (i.e. only <unk> words)
Fix: reading on input, input length check was wrong. Now outputs
-9999 if, and only if, the line is empty (i.e. only <unk> words)

Ubiqus/tf_rnnlm,pltrdy/tf_rnnlm,pltrdy/tf_rnnlm,Ubiqus/tf_rnnlm