Beta 2.5.3 (#10776)

* ethcore/res: activate atlantis classic hf on block 8772000 (#10766)

* fix docker tags for publishing (#10741)

* fix: aura don't add `SystemTime::now()` (#10720)

This commit does the following:
- Prevent overflow in `verify_timestamp()` by not adding `now` to found faulty timestamp
- Use explicit `CheckedSystemTime::checked_add` to prevent potential consensus issues because SystemTime is platform
depedent
- remove `#[cfg(not(time_checked_add))]` conditional compilation

* Update version

* Treat empty account the same as non-exist accounts in EIP-1052 (#10775)

* DevP2p: Get node IP address and udp port from Socket, if not included in PING packet (#10705)

* get node IP address and udp port from Socket, if not included in PING packet

* prevent bootnodes from being added to host nodes

* code corrections

* code corrections

* code corrections

* code corrections

* docs

* code corrections

* code corrections

* Apply suggestions from code review

Co-Authored-By: David <dvdplm@gmail.com>

* Add a way to signal shutdown to snapshotting threads (#10744)

* Add a way to signal shutdown to snapshotting threads

* Pass Progress to fat_rlps() so we can abort from there too.

* Checking for abort in a single spot

* Remove nightly-only weak/strong counts

* fix warning

* Fix tests

* Add dummy impl to abort snapshots

* Add another dummy impl for TestSnapshotService

* Remove debugging code

* Return error instead of the odd Ok(())
Switch to AtomicU64

* revert .as_bytes() change

* fix build

* fix build maybe

ethcore/src/externalities.rs

@@ -314,7 +314,11 @@ impl<'a, T: 'a, V: 'a, B: 'a> Ext for Externalities<'a, T, V, B>
 	}
 
 	fn extcodehash(&self, address: &Address) -> vm::Result<Option<H256>> {
-		Ok(self.state.code_hash(address)?)
+		if self.state.exists_and_not_null(address)? {
+			Ok(self.state.code_hash(address)?)
+		} else {
+			Ok(None)
+		}
 	}
 
 	fn extcodesize(&self, address: &Address) -> vm::Result<Option<usize>> {