Reinforce error handling of secrets client

import org.springframework.beans.factory.annotation.Value;

import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;

import org.springframework.stereotype.Service;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

@Service

@ConditionalOnExpression("${SECRETS_CONTROLLER_ENABLE:false}")

public class SecretsClient {

	private static final transient Log logger = LogFactory.getLog( SecretsClient.class.getName() );

	private final ProducerTemplate producerTemplate;

	private final String unsealSecretQueue;

			final var cmd = new UnsealCharacteristicCommand(uri, characteristic);

			final var payload = this.mapper.writeValueAsString(cmd);

			final var responseRaw = this.producerTemplate.requestBody(this.unsealSecretQueue, payload, String.class);

			if (responseRaw == null || responseRaw.isEmpty()) {

				return uri;

			}

			final var response = this.mapper.readValue(responseRaw, String.class);

			if (response == null)

				return "";

			if (response == null || response.isEmpty()) {

				return uri;

			}

			return response;

		} catch (JsonProcessingException e) {

			throw new RuntimeException(e);

		} catch (Exception e) {

			// controller is enabled by the request failed (no route, timeout, broker down)

			logger.warn("Secrets controller did not respond for " + uri, e);

			return uri;

		}

	}