fix(viewDirective): $injector.has() not in angular#1.0.8

$injector.get() doesn't throw unless the key is not useable, or unless there
is a circular dependency, so there's no issue just using it this way, so that
it doesn't break 1.0.8.

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This bug breaks @mojjojo's app in 1.0.8, so a quick fix would be good for them.