[ problem ] misspelled agent reference is not obvious. 404 apu error without being specific about which agent could not be found

[LukeLalor]

repro:
given you have an agent named foobar (not required for actual repro)

1. create agent with agent_refs foo
2. use agent

desired:
logs should indicate that agent "foo" was not found

actual:
logs indicate agent is not found, but no "foo" pointer.