v-repeat does not completely teardown when reduced in length

[alchen]

In the latest dev branch, I ran into an issue with assigning new values to props used by a component after its associated list of items in v-repeat has reduced in length.

It appears that some expired items are still watching for changes; they try to set undefined[prop] and fail.

JSFiddle: http://jsfiddle.net/alchen/42ht4eg0/

[yyx990803]

Thanks for reporting this! This is indeed caused by the latest commit on dev, but the fix doesn't really address the root cause. I've made the proper fix in the commit above.