Check block CLI command (#4240)

* Check block operation

* Update client/cli/src/lib.rs

* Update client/cli/src/params.rs

substrate/client/consensus/babe/src/lib.rs

@@ -436,6 +436,7 @@ impl<B, C, E, I, Error, SO> slots::SimpleSlotWorker<B> for BabeWorker<B, C, E, I
 				// https://github.com/paritytech/substrate/issues/3623
 				fork_choice: ForkChoiceStrategy::LongestChain,
 				allow_missing_state: false,
+				import_existing: false,
 			}
 		})
 	}
@@ -775,6 +776,7 @@ impl<B, E, Block, RA, PRA> Verifier<Block> for BabeVerifier<B, E, Block, RA, PRA
 					// https://github.com/paritytech/substrate/issues/3623
 					fork_choice: ForkChoiceStrategy::LongestChain,
 					allow_missing_state: false,
+					import_existing: false,
 				};
 
 				Ok((block_import_params, Default::default()))

substrate/client/consensus/babe/src/tests.rs

@@ -579,6 +579,7 @@ fn propose_and_import_block(
 			auxiliary: Vec::new(),
 			fork_choice: ForkChoiceStrategy::LongestChain,
 			allow_missing_state: false,
+			import_existing: false,
 		},
 		Default::default(),
 	).unwrap();