Check block CLI command (#4240)

* Check block operation

* Update client/cli/src/lib.rs

* Update client/cli/src/params.rs

substrate/test/utils/transaction-factory/src/lib.rs

@@ -199,6 +199,7 @@ fn import_block<Backend, Exec, Block, RtApi>(
 		auxiliary: Vec::new(),
 		fork_choice: ForkChoiceStrategy::LongestChain,
 		allow_missing_state: false,
+		import_existing: false,
 	};
 	(&**client).import_block(import, HashMap::new()).expect("Failed to import block");
 }