STORKSAMLEngine breaks into exception when there is an attribute with no value

With Ricardo Ferreira we discovered a bug in STORKSAMLEngine. It happens when isAgeOver is requested and the age of the citizen is lower than requested. The returned attribute isAgeOver in this case by specification has no value. The method STORKSAMLEngine.generateAttributeStatement in the line if (attribute.getValue().size() > 0 && attribute.getComplexValue().size() > 0) { breaks with NPE, as attribute.getValue() is null.

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