Handle empty reuqest object error explicitly only logging an info message

[c-pius]

The parser throws an error if the request object is nil: https://github.com/kyma-project/runtime-watcher/blob/main/runtime-watcher/internal/requestparser/parser.go#L39

As of now, we record this as an error with log and event: https://github.com/kyma-project/runtime-watcher/blob/main/runtime-watcher/internal/handler.go#L75-L80

The empty request object is an expected condition though. We should rather handle this error explicitly and log it as an info without an event being raised.

AC

• when an empty request is handled
  • parser throws the error
  • handler handles it explicitly by
    • logging an info like "skipped handling due to empty request object"
    • returning