map_listings() ignores homes with missing addresses

[ngbasch]

First off, as someone with a shared frustration of dealing with real-estate agents, thank you for creating this package.

As I was looking for properties using the search "02139, Cambridge, MA", I found that there were more properties listed directly on the realtor.com site (17 currently) than using the map_listings() function (14 currently). After some investigating, it looks like the 3 properties that aren't showing up are the only listings that don't list their exact address (despite being listed in the 02139 zip code search).

I imagine there are several homes listed on realtor.com that would be worth tracking via map_listings(), even without having an exact address. Not sure if you think it's possible or worth updating map_listings() to pull these listings as well, but thought it would be at least worthwhile to note in case you wanted to update documentation.

Apologies in advance if I am off-base here.