fix image build

src/main/python/ddadevops/application/image_build_service.py

@@ -58,8 +58,6 @@ class ImageBuildService:
 
     def dockerhub_publish(self, devops: Devops):
         image = devops.specialized_builds[BuildType.IMAGE]
-        if image.image_tag is None or image.image_tag == "":
-            raise ValueError(f"image_tag must not be empty.")
         self.image_api.dockerhub_publish(
             devops.name, image.image_dockerhub_user, image.image_tag
         )

src/main/python/ddadevops/domain/init_service.py

@@ -105,6 +105,7 @@ class InitService:
             if not tag:
                 tag = version.to_string()
 
+        if tag:
             result["image_tag"] = tag
 
         return result