Don't fail in crispin.py when supports_condstore attribute is missing.
Don't fail in crispin.py when supports_condstore attribute is missing.

Outlook is generic IMAP, but the OutlookAccount class doesn't have the
supports_condstore attribute.

Fixes T272.

Eagles2F/sync-engine,closeio/nylas,Eagles2F/sync-engine,wakermahmud/sync-engine,gale320/sync-engine,nylas/sync-engine,gale320/sync-engine,closeio/nylas,wakermahmud/sync-engine,gale320/sync-engine,wakermahmud/sync-engine,wakermahmud/sync-engine,PriviPK/privipk-sync-engine,Eagles2F/sync-engine,jobscore/sync-engine,EthanBlackburn/sync-engine,gale320/sync-engine,nylas/sync-engine,ErinCall/sync-engine,ErinCall/sync-engine,Eagles2F/sync-engine,ErinCall/sync-engine,EthanBlackburn/sync-engine,wakermahmud/sync-engine,PriviPK/privipk-sync-engine,EthanBlackburn/sync-engine,nylas/sync-engine,ErinCall/sync-engine,jobscore/sync-engine,nylas/sync-engine,jobscore/sync-engine,jobscore/sync-engine,gale320/sync-engine,closeio/nylas,PriviPK/privipk-sync-engine,EthanBlackburn/sync-engine,ErinCall/sync-engine,Eagles2F/sync-engine,EthanBlackburn/sync-engine,PriviPK/privipk-sync-engine,closeio/nylas,PriviPK/privipk-sync-engine