fix: when collection does not have property, should still sort

[eugenethered]

There's an issue when collection does not have a property when performing orderBy.

For example: Let's say you store multiple entities... as cats.

1. {name: "socks", born: "2001"}
2. {name: "ginger"}
3. {name: "furball, born: "2020"}

If you use the existing code and try orderBy('born') it will explode💥 because the property "born" for ginger does not exist.

The fix Essentially it just does a simple check that both compared entities, both have the desired property.

Hope this helps.