Merge bitcoin#21718: rpc: Improve error message for getblock invalid datatype.

a411494 rpc: Improve getblock error message for invalid data type. (klementtan)

Pull request description:

  Improve error messages for getblock invalid datatype.

  fixes: bitcoin#21717

ACKs for top commit:
  instagibbs:
    utACK bitcoin@a411494
  theStack:
    ACK a411494
  promag:
    Code review ACK a411494.

Tree-SHA512: 6e7d8290681e8ab375629f81669d0f8e0c21f9eb7ed9e2455cd19ea013e69b2d95fa7a9ee795315b2d5c60c96035c6cefc3d6e1039a06fd88c1dc7fe275ee6a1

Author: fanquake

src/rpc/blockchain.cpp

@@ -1242,10 +1242,11 @@ static RPCHelpMan getblock()
 
     int verbosity = 1;
     if (!request.params[1].isNull()) {
-        if(request.params[1].isNum())
-            verbosity = request.params[1].get_int();
-        else
+        if (request.params[1].isBool()) {
             verbosity = request.params[1].get_bool() ? 1 : 0;
+        } else {
+            verbosity = request.params[1].get_int();
+        }
     }
 
     const NodeContext& node = EnsureAnyNodeContext(request.context);

test/functional/rpc_blockchain.py

@@ -442,6 +442,9 @@ def _test_getblock(self):
         self.log.info("Test getblock with verbosity 2 still works with pruned Undo data")
         datadir = get_datadir_path(self.options.tmpdir, 0)
 
+        self.log.info("Test that getblock with invalid verbosity type returns proper error message")
+        assert_raises_rpc_error(-1, "JSON value is not an integer as expected", node.getblock, blockhash, "2")
+
         def move_block_file(old, new):
             old_path = os.path.join(datadir, self.chain, 'blocks', old)
             new_path = os.path.join(datadir, self.chain, 'blocks', new)