removed pattern dependency when it is not needed in order to fix #461

[ziky90]

This PR should fix the bug described in #461

[piskvorky]

Hmm, do we even need this if? When users try to call lemmatize, and pattern is not installed, they'll get a clear, standard ImportError.

I'm not sure why this if is here, I don't think it belongs any more, conceptually. But maybe I'm missing something.

[piskvorky]

Thanks @ziky90 ! It's a welcome change.

Not sure why we even need to mask out lemmatize() -- I think it can stay in utils, no matter whether pattern is installed or not.

[ziky90]

@piskvorky You're right. I've removed the if and added there check inside lemmatize() with hopefully clear message about that there needs to be pattern installed in order to use it.

Also the non passing test seems to me as not related to changes that I have made.

[piskvorky]

Thanks @ziky90 .

@gojomo this is the "rank of word2vec/doc2vec" failing test rearing its head again. If there's no way to make the tests more robust, I'm +1 on removing them, rather than obscure unrelated PRs.

[piskvorky]

@ziky90 before merging, can you also add a note to CHANGELOG summarizing this change?

And also mentioning how to deal with the missing HAS_PATTERN, in case people depended on that attribute, so they know how to migrate.

[ziky90]

Information about this PR added to the CHANGELOG.

[piskvorky]

utlis => utils, chnged => changed :)

[ziky90]

I'm sorry for silly typos :(, anyway typos were fixed.

[piskvorky]

Perfect, merging. Thanks @ziky90