client: Stops creating client when secret is too short (#764)

Previously, clients were created despite an error which said that the secret was too short. This patch changes that and improves error output in the CLI as well for this command.

Closes #725

client/handler.go

@@ -139,6 +139,7 @@ func (h *Handler) Create(w http.ResponseWriter, r *http.Request, _ httprouter.Pa
 		c.Secret = string(secret)
 	} else if len(c.Secret) < 6 {
 		h.H.WriteError(w, r, errors.New("The client secret must be at least 6 characters long"))
+		return
 	}
 
 	secret := c.Secret

cmd/cli/handler_helper.go

@@ -28,6 +28,7 @@ func checkResponse(response *hydra.APIResponse, err error, expectedStatusCode in
 
 	if response.StatusCode != expectedStatusCode {
 		fmt.Fprintf(os.Stderr, "Command failed because status code %d was expeceted but code %d was received.\n", expectedStatusCode, response.StatusCode)
+		fmt.Fprintf(os.Stderr, "The server responded with:\n%s\n", response.Payload)
 		os.Exit(1)
 		return
 	}