If an object definition already has an example, we shouldn't try to extend that
definition by adding examples derived from the individual properties. Doing so
is confusing, and there is no way to inhibit it when it is not desired. It's
also not what the RapiDoc viewere does, so we end up with examples being
inconsistent.
* Fix rendering of response examples
Fixes the autogeneration of JSON examples for array objects. This fixes a
number of "Specification error: Example invalid or not present" errors in the
rendered spec.
* Unbreak examples for non-objects/arrays
The previous change had broken auto-generated examples for everything that
wasn't an object or array; fix it up again.
* Remove conditions on $example
Everything should now have a generated example, so the condition is
redundant. Furthermore it was suppressing examples for APIs where the example
was an empty dict.
