Add check for invalid collection name in python sdk

Signed-off-by: Nophunter233 <chengming.li@zilliz.com>

tests/python_test/requirements.txt

@@ -2,7 +2,7 @@ grpcio==1.26.0
 grpcio-tools==1.26.0
 numpy==1.18.1
 pytest-cov==2.8.1
-pymilvus-distributed==0.0.40
+pymilvus-distributed==0.0.41
 sklearn==0.0
 pytest==6.2.2
 pytest-timeout==1.3.3

tests/python_test/test_flush.py

@@ -65,7 +65,7 @@ class TestFlushBase:
             message = getattr(e, 'message', "The exception does not contain the field of message.")
             assert message == "describe collection failed: can't find collection: %s" % collection_new
 
-    @pytest.mark.tags("fail")
+    @pytest.mark.tags("0331")
     def test_flush_empty_collection(self, connect, collection):
         '''
         method: flush collection with no vectors