fix site-node test in regression test don't use per-request caching, since we migh shoot in our own foot interrupt cache_transaction to achi…
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fix site-node test in regression testdon't use per-request caching, since we migh shoot in our own footinterrupt cache_transaction to achieve desired semanticsallow in a few cases empty node_ids for method "get_url" as it is used by current OpenACS
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