fix assopy_invoice tests that was broken due to full pre-rendering invoice when its created
fix assopy_invoice tests that was broken due to full pre-rendering invoice when its created

artcz/epcon,artcz/epcon,EuroPython/epcon,artcz/epcon,artcz/epcon,artcz/epcon,EuroPython/epcon,EuroPython/epcon,artcz/epcon,EuroPython/epcon