Impossible to import assertions when an attribute is present and empty

<testAssertion id="ITI40-024">
<predicate lg="NATURAL">predicate</predicate>
<prescription level="mandatory"/>
<tag tname="Section">3.40.4.1.2</tag>
<tag tname="Page">151</tag>
<status>TO_BE_REVIEWED</status>
<testable></testable>
</testAssertion>

In this example testable is present but empty. In this case the upload will fail.