Fixed: the "pluralize" filter with multi arguments, when selected arg…

[nervgh]

In Vue.js 1.0.25 the "pluralize" filter returns "three"

Vue.filter('pluralize')(1, "", "two", "three") // three

instead of the empty string. After this fix, the "pluralize" filter returns the empty string:

Vue.filter('pluralize')(1, "", "two", "three") // ""

[yyx990803]

Thanks!