update HasAllMultiClientEnvVars() (#5459)

Signed-off-by: daquexian <daquexian566@gmail.com>

Co-authored-by: oneflow-ci-bot <69100618+oneflow-ci-bot@users.noreply.github.com>

oneflow/python/framework/env_util.py

@@ -394,13 +394,12 @@ def GetEnvDefaultParallelConf(device_tag):
 
 
 def HasAllMultiClientEnvVars():
-    return (
-        os.getenv("MASTER_ADDR")
-        and os.getenv("MASTER_PORT")
-        and os.getenv("WORLD_SIZE")
-        and os.getenv("RANK")
-        and os.getenv("LOCAL_RANK")
-    )
+    env_var_names = ["MASTER_ADDR", "MASTER_PORT", "WORLD_SIZE", "RANK", "LOCAL_RANK"]
+    has_all_env_vars = all([os.getenv(x) for x in env_var_names])
+    if not has_all_env_vars:
+        has_at_least_one_env_var = any([os.getenv(x) for x in env_var_names])
+        assert not has_at_least_one_env_var
+    return has_all_env_vars
 
 
 def _UpdateDefaultEnvProtoByMultiClientEnvVars(env_proto):