make grouper client properties optional

Exception in thread "main" java.lang.ExceptionInInitializerErrorException in thread "main" java.lang.ExceptionInInitializerError at edu.internet2.middleware.grouperClient.api.GcStemSave.execute(GcStemSave.java:144) at edu.upenn.isc.esbUtilities.util.EsbPenngroupsClient.executeCreateFolder(EsbPenngroupsClient.java:298) at edu.upenn.isc.esbUtilities.util.EsbPenngroupsClient.main(EsbPenngroupsClient.java:56)

Caused by: java.lang.RuntimeException: Problem reading config: 'classpath:grouper.client.properties' at edu.internet2.middleware.grouperClient.config.ConfigPropertiesCascadeBase$ConfigFile.retrieveContents(ConfigPropertiesCascadeBase.java:762) at edu.internet2.middleware.grouperClient.config.ConfigPropertiesCascadeBase.retrieveFromConfigFiles(ConfigPropertiesCascadeBase.java:998) at edu.internet2.middleware.grouperClient.config.ConfigPropertiesCascadeBase.retrieveFromConfigFiles(ConfigPropertiesCascadeBase.java:889) at edu.internet2.middleware.grouperClient.config.ConfigPropertiesCascadeBase.retrieveFromConfigFileOrCache(ConfigPropertiesCascadeBase.java:1094) at edu.internet2.middleware.grouperClient.config.ConfigPropertiesCascadeBase.retrieveConfig(ConfigPropertiesCascadeBase.java:105) at edu.internet2.middleware.grouperClient.util.GrouperClientConfig.retrieveConfig(GrouperClientConfig.java:51) at edu.internet2.middleware.grouperClient.util.GrouperClientUtils.retrieveLog(GrouperClientUtils.java:154) at edu.internet2.middleware.grouperClient.ws.GrouperClientWs.<clinit>(GrouperClientWs.java:135) ... 3 more

Caused by: java.lang.RuntimeException: Cant find config file from classpath: grouper.client.properties at edu.internet2.middleware.grouperClient.config.ConfigPropertiesCascadeBase$ConfigFileType$3.inputStream(ConfigPropertiesCascadeBase.java:661) at edu.internet2.middleware.grouperClient.config.ConfigPropertiesCascadeBase$ConfigFile.retrieveContents(ConfigPropertiesCascadeBase.java:755) ... 10 more