Current behaviour:
When using Active Docs CRD to create a spec with OAS 3.0.X that contains the empty field content { } under the response object the operator crashes although the spec is created in the admin portal.

The operator logs shows the following:

E0310 12:34:26.431989       1 runtime.go:76] Observed a panic: cannot handle unexported field at {*openapi3.Swagger}.Components.Schemas["ApiResponse"].Value.compiledPattern:
  "github.com/getkin/kin-openapi/openapi3".Schema
consider using a custom Comparer; if you control the implementation of type, you can also consider using an Exporter, AllowUnexported, or cmpopts.IgnoreUnexported
goroutine 589 [running]:
k8s.io/apimachinery/pkg/util/runtime.logPanic(0x178baa0, 0xc002668c20)
  /remote-source/deps/gomod/pkg/mod/k8s.io/apimachinery@v0.18.6/pkg/util/runtime/runtime.go:74 +0xa3

Desired behaviour:
Avoid the operator to crash when the empty value is present and display a warning or error.

Additional notes:

• The ActiveDocOpenAPIRefSpec points out that the supported OpenAPI version is 3.0.2, however it works for 3.0.0 & 3.0.1 versions as well without the empty field content { }.
• The empty field content { } is added when converting the spec from v2 to openapi 3 with the Swagger editor. The same file used in another editor does not use the field content { }.
• The content field does not seem a difference between OAS versions 3.0.0, 3.0.1 & 3.0.2 and the specification states that should be a string.