Not worked in Opal 0.10.4

[zw963]

Following is debug output:

TypeError: item is undefined[Learn More] conway.js:11546:11
	$$hash file:///home/zw963/Project/conway_gol/app/conway.js:11546:11
	Opal.hash_get file:///home/zw963/Project/conway_gol/app/conway.js:1669:20
	Opal.modules["corelib/hash"]/</TMP_6 file:///home/zw963/Project/conway_gol/app/conway.js:13009:19
	TMP_17 file:///home/zw963/Project/conway_gol/app/conway.js:23054:14
	TMP_12 file:///home/zw963/Project/conway_gol/app/conway.js:23024:20
	$$get_state_at file:///home/zw963/Project/conway_gol/app/conway.js:23008:18
	$$new_state/TMP_9 file:///home/zw963/Project/conway_gol/app/conway.js:23001:38
	Opal.yield1 file:///home/zw963/Project/conway_gol/app/conway.js:1194:14
	$$each file:///home/zw963/Project/conway_gol/app/conway.js:13204:9
	$$new_state file:///home/zw963/Project/conway_gol/app/conway.js:22999:8
	$$tick file:///home/zw963/Project/conway_gol/app/conway.js:22991:15
	$$run/TMP_6 file:///home/zw963/Project/conway_gol/app/conway.js:22985:14
	Opal.yieldX file:///home/zw963/Project/conway_gol/app/conway.js:1220:12
	$$call file:///home/zw963/Project/conway_gol/app/conway.js:15215:20
	$$initialize/self.interval< file:///home/zw963/Project/conway_gol/app/conway.js:22906:53

Seem like some hash change broken this example

Thanks

[zw963]

Fixed.