cli: check empty container and object attributes

Check for the key and value of the container attributes for emptiness to prevent
panic in the sdk.
Check for the key and value of the object attributes for emptiness to prevent
error from rpc.

Signed-off-by: Andrey Butusov <andrey@nspcc.io>

cmd/neofs-cli/modules/container/create.go

@@ -238,6 +238,12 @@ func parseAttributes(dst *container.Container, attributes []string) error {
 				"you need to use one of them or make it equal")
 		}
 
+		if kvPair[0] == "" {
+			return errors.New("empty attribute key")
+		} else if kvPair[1] == "" {
+			return fmt.Errorf("empty attribute value for key %s", kvPair[0])
+		}
+
 		dst.SetAttribute(kvPair[0], kvPair[1])
 	}
 

cmd/neofs-cli/modules/object/put.go

@@ -225,6 +225,12 @@ func parseObjectAttrs(cmd *cobra.Command, ctx context.Context) ([]object.Attribu
 			}
 		}
 
+		if kv[0] == "" {
+			return nil, errors.New("empty attribute key")
+		} else if kv[1] == "" {
+			return nil, fmt.Errorf("empty attribute value for key %s", kv[0])
+		}
+
 		attrs[i].SetKey(kv[0])
 		attrs[i].SetValue(kv[1])
 	}