Interceptor can't handle null JSON value

[abakes]

I was converting a GET handler into a POST. I was doing this to pass in a paging token. However, the first page passes in null for this value. In the debugger, the code would only get hit if I provided a value for this (the only property in the request). If null was passed, my code would not get hit, the request would never complete, and be left pending.

Debugging the misk code, a handler was initially found for the request, but it seemed to get dropped in moving through the chain of interceptors, when trying to deserialize JSON request body.