Exceptions aren't caught in request handlers

[chbaker0]

Because exceptions aren't dealt with in the request handler functions in capstats_server.cpp, they exhibit some unexpected behavior. For example, when fetching an invalid user, a '500 Internal Server Error' response is sent rather than a '404 Not Found'.

[gussmith23]

acknowledged. request handlers will be rewritten regardless, but I will keep this in mind when rewriting

[gussmith23]

oh, nevermind, thanks for the fix

[chbaker0]

I'm still adding more exception handlers, if you don't want that I can just stop. In the process I am basically rewriting the handlers anyway.