in src/main/java/aws/cfn/codegen/json/Config.java [162:170]
public Config(@JsonProperty("specifications") final Map<String, URI> specifications,
@JsonProperty("settings") final Settings settings,
@JsonProperty("groups") final Map<String, GroupSpec> groups) {
this.specifications = specifications != null ? specifications : new LinkedHashMap<>(1);
this.settings = settings;
this.groups = groups != null ? groups : new LinkedHashMap<>();
validateRegionSpecs();
validateGroups();
}