fix(workflows-sdk): use loaded modules when container is empty (#7422)

packages/core/orchestration/src/joiner/remote-joiner.ts

@@ -244,18 +244,6 @@ export class RemoteJoiner {
       { fieldAlias, relationships },
     ] of expandedRelationships) {
       if (!this.serviceConfigCache.has(serviceName)) {
-        // If true, the relationship is an internal service from the medusa core
-        // If modules are being used ouside of the core, we should not be throwing
-        // errors when the core services are not found in cache.
-        // TODO: Remove when there are no more "internal" services
-        const isInternalServicePresent = relationships.some(
-          (rel) => rel.isInternalService === true
-        )
-
-        if (isInternalServicePresent) {
-          continue
-        }
-
         throw new Error(`Service "${serviceName}" was not found`)
       }