app: avoid evaluating impossible condition - #253
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If the `el.hasAttribute('v-scope')` condition is true, then `roots` is set to
the non-empty array `[el]` and can never be empty; it can only be empty if the
condition does not hold and the `else` branch is taken.
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If the
el.hasAttribute('v-scope')condition is true, thenrootsis set to the non-empty array[el]and can never be empty; it can only be empty if the condition does not hold and theelsebranch is taken.