Fix render implementation in AuctionApp routes
Fix render implementation in AuctionApp routes

If provided, a `render` function in a [found][] router implementation
will execute before and after a Relay response is available. To account
for the early invocation, guard against the presence of `props`.

[found]: https://github.com/4Catalyzer/found

Co-authored-by: Daniel Levenson <b7da32c8f1262542561d6343e06dc42491ccdbbd@gmail.com>

xtina-starr/reaction,xtina-starr/reaction,artsy/reaction-force,artsy/reaction-force,xtina-starr/reaction,artsy/reaction,xtina-starr/reaction,artsy/reaction,artsy/reaction