Fix #393, make open notebook with uri type work
Check the right property 'type' instead of 'uriType'. This was
regressed in 385af695.
Check if tagMap2 is defined before access when converting from nb v1
Merge pull request #394 from twosigma/alee/fix-393

Fix #393, fix open notebook with uri type
Merge pull request #395 from twosigma/alee/minor-fix

Check if tagMap2 is defined before access when converting from nb v1
Merge remote-tracking branch 'origin/master' into alee/fix-266