docs.getText regression, now always errors out with "Field mask cannot retrieve comment-specific fields when include_comments is false"

[lynnjepsen]

I was using this extension just fine for days. But 2 days ago, whenever I use docs.getText in particular, it does a "Field mask cannot retrieve comment-specific fields when include_comments is false" error and can't successfully get the text.

[allenhutchison]

This is fixed at head. #349