Fix attaching channels to packages

Author: AnastasiaSliusar

empack/filter_env.py

@@ -69,8 +69,9 @@ def iterate_env_pkg_meta(env_prefix):
 
 
 def write_minimal_conda_meta(pkg_meta, env_prefix):
-    content = {k: pkg_meta[k] for k in ["name", "version", "build", "build_number", "channel"]}
+    content = {k: pkg_meta[k] for k in ["name", "version", "build", "build_number"]}
     content["url"] = pkg_meta.get("url", None)
+    content["channel"] = pkg_meta.get("channel", "defaults")
     conda_meta_dir = Path(env_prefix) / "conda-meta"
     conda_meta_dir.mkdir(parents=True, exist_ok=True)