The pages list in ReplayWeb.page doesn't populate with pages from WARC files created in warcit

[Shrinks99]

Context

This is a problem that has been encountered in a few forum posts (and also in my own projects!) at this point and deserves a real issue :)

What did you expect to happen? What happened instead?

WARC files created with warcit display valid URLs in the URLs list however they aren't listed as pages.

Step-by-step reproduction instructions

1. Create a WARC with warcit
2. Load the resulting WARC file into ReplayWeb.page
3. Note the URL list (full of URLs) and the empty pages list