Fix import append mode unit test, that was passing when it should fail.

ludovicp

05.47.2010 bb6572b5d4a90870aec9dbd761b96fda85343fae

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user-friendly-name=Sk\u0142adnia Atrybut\u00f3w
user-friendly-plural-name=Sk\u0142adnie Atrybut\u00f3w