fix get_recent_comments on selenium/requests.Session (Fixes #124)

[stefco]

Description

Post.get_recent_comments would raise a KeyError when using Selenium or a requests.Session object to scrape a Post due to slight differences in the structure of the resulting json_dict. I added an except block to handle this and try the alternative json_dict schema.

Fixes #124

Checklist

• [x] I followed the guidelines in our Contributing document
• [x] I added an explanation of my changes
• [ ] I have written new tests for my changes, as applicable
• [ ] I successfully ran tests with my changes locally

Additional notes (optional)

Still need to write unit tests.

[stefco]

Moved this and several other suggested fixes to #125, easier to just track there.