maven-war-plugin webResources 配置问题

[a_benben]

现有配置:

			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-war-plugin</artifactId>
				<version>2.1.1</version>
				<configuration>
					<webResources>
						<resource>
							<directory>/app/config/jenkins/src/main/resources/</directory>
							<targetPath>WEB-INF/classes/</targetPath>
							<includes>
								<include>**/*.xml</include>
								<include>**/*.properties</include>
								<include>**/*.json</include>
							</includes>
						</resource>
					</webResources>
				</configuration>
			</plugin>

声明maven在打war包时, 从外部/app/config/jenkins/src/main/resources/下拷贝资源文件到项目内, 但是当/app/config/jenkins/src/main/resources/ 不存在时, maven会打包失败, 报错

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.1.1:war (default-war) on project xxx: Execution default-war of goal org.apache.maven.plugins:maven-war-plugin:2.1.1:war failed: basedir \app\config\jenkins\src\main\resources does not exist -> [Help 1]

我的项目在有些环境下, 这个资源目录确实可以不打进来, 请问如何配置为, 当目录找不到时, 忽略本条资源拷贝, 继续后续资源拷贝, 完成打包?