support torrents whose name is empty

ChangeLog

@@ -87,6 +87,7 @@
 	  incoming connection
 	* added more detailed instrumentation of the disk I/O thread
 
+	* support torrents whose name is empty
 	* fixed connection limit to take web seeds into account as well
 	* fixed bug when receiving a have message before having the metadata
 	* fixed python bindings build with disabled DHT support

src/torrent_info.cpp

@@ -788,6 +788,7 @@ namespace libtorrent
 		}
 
 		std::string name = name_ent->string_value();
+		if (name.empty()) name = to_hex(m_info_hash.to_string());
 		name = sanitize_path(name);
 	
 		if (!valid_path_element(name))