[Bug] Blank Org name allowed in service call

The service call allows me to provide a blank org name for target that results in a failure as the correct github URL is not used to push the generated service
curl -X POST https://987wmb4kg2.execute-api.us-east-1.amazonaws.com/prod//services \
-H "Content-Type: application/json" \
-d '{
"serviceName": "elasticpath-cart",
"serviceType": "spring",
"description": "demo",
"model": "https://raw.githubusercontent.com/aws-samples/industry-reference-models/refs/heads/main/domains/retail/models/cart/model/cart.openapi.yaml",
"config": {
"basePackage": "com.industrytoolkit.ep",
"modelPackage": "com.industrytoolkit.ep.model",
"apiPackage": "com.industrytoolkit.ep.api",
"invokerPackage": "com.industrytoolkit.ep.configuration",
"groupId": "com.industrytoolkit.ep",
"artifactId": "cart"
},
"target": {
"org": "",
"secretKey": "aws-industry-toolkit-github",
"email": "wilthank@amazon.com",
"name": "Robot"
}
}'
cloudwatch logs:
2024-10-17T18:49:11.957Z
fatal: repository ‘https://github.com//elasticpath-cart.git/’ not found
2024-10-17T18:49:11.957Z
2024-10-17T18:49:11.957Z
[Container] 2024/10/17 18:49:11.937542 Command did not exit successfully git push -u origin main exit status 128
2024-10-17T18:49:11.957Z
[Container] 2024/10/17 18:49:11.942840 Phase complete: POST_BUILD State: FAILED
2024-10-17T18:49:11.957Z

Start by reproducing the POST request to the /services endpoint with an empty target.org and compare it with the CloudWatch failure showing the malformed GitHub repository URL. Trace the service-call validation and repository-push path; done means a blank organization is rejected before the push is attempted and the failure is reported clearly.

Written by the indexing model from the issue text.