Allow dev_package_path only

Author: T4rk1n

dash/resources.py

@@ -47,8 +47,9 @@ def _filter_resources(self, all_resources, dev_bundles=False):
                 filtered_resource["namespace"] = s["namespace"]
             if "external_url" in s and not self.config.serve_locally:
                 filtered_resource["external_url"] = s["external_url"]
-            elif "dev_package_path" in s and dev_bundles:
-                filtered_resource["relative_package_path"] = s["dev_package_path"]
+            elif "dev_package_path" in s:
+                if dev_bundles:
+                    filtered_resource["relative_package_path"] = s["dev_package_path"]
             elif "relative_package_path" in s:
                 filtered_resource["relative_package_path"] = s["relative_package_path"]
             elif "absolute_path" in s: