Commit.post has invalid defaults

[tpaixao]

When posting a top-level comment using

steem.commit.post(title,body,author,permlink,reply_indentifier,json_metadata,comment_options,community,tags)

you NEED to set the tags argument to the category you want the post to appear in. Otherwise, you get an error about your permlink being the wrong size. However, the default value is None.