Potentially a bug of resetting vocab size when a vocab file is specified

[zyxue]

If a -read-vocab file is specified, then all their counts are 0, it seems SortVocab() will remove all words in such case.

word2vec/src/word2vec.c

Line 323 in 5f2e966

SortVocab();

word2vec/src/word2vec.c

Line 155 in 5f2e966

if ((vocab[a].cn < min_count) && (a != 0)) {