Fix typo in get_object_or_404 for healthchecks.
Fix typo in get_object_or_404 for healthchecks.

Change-Id: I69eda2f3b39d9535e2c9af34b7f653aef225a396

Linaro/lava-server,Linaro/lava-server,Linaro/lava-server,Linaro/lava-server