`retrieve_block_timeout(...)` crashes entire horde if invalid ip is added to timeout

[tazlin]

	@staticmethod
	def retrieve_block_timeout(ipaddr):
		'''Checks if the IP is in a block timeout'''
		if not ip_t_r:
			return
		for ip_block_key in ip_t_r.scan_iter("ipblock_*"):
			ip_range = ip_block_key.decode().split('_',1)[1]
			if ipaddress.ip_address(ipaddr) in ipaddress.ip_network(ip_range):
				ttl = ip_t_r.ttl(ip_block_key)
				return int(ttl)
		return 0

The line if ipaddress.ip_address(ipaddr) in ipaddress.ip_network(ip_range): needs to try/except or check for an invalid IP to eliminate the possibility of a moderator bringing the entire horde down over a typo in the IP.