Prevent block/tx parsing for addresses when no subscriptions.

Author: evoskuil

src/workers/notification_worker.cpp

@@ -336,7 +336,10 @@ bool notification_worker::handle_reorganization(const code& ec,
         return true;
     }
 
-    // Blockchain height is 64 bit but obelisk protocol is 32 bit.
+    if (address_subscriber_->empty())
+        return true;
+
+    // Blockchain height is size_t but obelisk protocol is 32 bit.
     auto fork_height32 = safe_unsigned<uint32_t>(fork_height);
 
     for (const auto block: *new_blocks)
@@ -416,6 +419,9 @@ bool notification_worker::handle_transaction_pool(const code& ec,
         return true;
     }
 
+    if (address_subscriber_->empty())
+        return true;
+
     notify_transaction(0, null_hash, tx);
     return true;
 }