parsing of search results fails with 2.1

[egonw]

TypeError: Cannot read property 'primaryTopic' of undefined
    at ConceptWikiSearch.parseResponse (/home/egonw/var/Projects/GitHub/ops.js/src/ConceptWikiSearch.js:182:17)
    at Request.callback (/home/egonw/var/Projects/GitHub/ops.js/test/spec/integration/ConceptWikiIntegrationSpec.js:24:32)
    at Request._callback (/home/egonw/var/Projects/GitHub/ops.js/src/ConceptWikiSearch.js:57:22)
    at self.callback (/home/egonw/var/Projects/GitHub/ops.js/node_modules/request/request.js:187:22)
    at emitOne (events.js:77:13)
    at Request.emit (events.js:169:7)
    at null._onTimeout (/home/egonw/var/Projects/GitHub/ops.js/node_modules/request/request.js:762:12)
    at Timer.listOnTimeout (timers.js:92:15)