Write with Overwrite = true fails if doc doesn't exist

[tleyden]

If you do a write with --param overwrite 'true' on a non-existent doc id:

wsk action invoke cloudant/write --blocking --result --param overwrite 'true' --param doc '{"foo": "bar", "_id": "nonexistent_docid"}'

it gives an error:

        "stack": "Error: missing\n    at Request._callback (/nodejsAction/node_modules/cloudant-nano/lib/nano.js:247:15)\n    at Request.self.callback (/nodejsAction/node_modules/request/request.js:186:22)\n    at emitTwo (events.js:106:13)\n    at Request.emit (events.js:191:7)\n    at Request.<anonymous> (/nodejsAction/node_modules/request/request.js:1081:10)\n    at emitOne (events.js:96:13)\n    at Request.emit (events.js:188:7)\n    at IncomingMessage.<anonymous> (/nodejsAction/node_modules/request/request.js:1001:12)\n    at IncomingMessage.g (events.js:291:16)",
        "statusCode": 404

But if I remove the --param overwrite 'true', it works. And then subsequent writes with --param overwrite 'true' succeed and update the revision.

In this case, I think it's safe to ignore the 404 error trying to do the GET to fetch the existing revision, since it's expected that it might be the first revision, and no existing revisions exist.

[daisy-ycguo]

#110 is a related issue.

[tleyden]

Here's a rough golang version that works as I would expect in terms of writing a new doc or overwriting an existing doc