Fixed warning for isUuidValid method
Fixed warning for isUuidValid method

apigee/apigee-ios-sdk,developerdave/apigee-ios-sdk,RobertWalsh/apigee-ios-sdk,apigee/apigee-ios-sdk,developerdave/apigee-ios-sdk,apigee/apigee-ios-sdk,RobertWalsh/apigee-ios-sdk,RobertWalsh/apigee-ios-sdk,apigee/apigee-ios-sdk,apigee/apigee-ios-sdk,RobertWalsh/apigee-ios-sdk,RobertWalsh/apigee-ios-sdk,apigee/apigee-ios-sdk,developerdave/apigee-ios-sdk,developerdave/apigee-ios-sdk,developerdave/apigee-ios-sdk,developerdave/apigee-ios-sdk,RobertWalsh/apigee-ios-sdk