Fix test migration crash waiting to happen due to inferred relations Avoid crashing when a relation definition which is already known (due to being inferred) gets explicitly added. As explained in a comment, this would deserve more thinking, but at least this fixes a test failure with computed relations.

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−#! /bin/sh -e
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−#
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−
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−if [ "$1" = configure ]; then
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−  if which install-docs >/dev/null 2>&1; then
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−    install-docs -i /usr/share/doc-base/cubicweb-doc
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−  fi
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−fi
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−
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−
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−#DEBHELPER#
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−
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−exit 0