CAO generates dummy ESPs that Wabbajack can't handle

[halgari]

Describe the bug
Cathedral Assets Optimizer generates dummy ESPs that only exist to load a BSA. Wabbajack doesn't know what to do with these.

Solution
We can detect if a .bsa exists with the same name, and if the ESP is super small (< 100 bytes) it's safe to assume that the .esp is empty. If those conditions are met we can include the .esp verbatim.