Ignore empty lines when parsing view results.

[rinverardi]

When a view produces no rows, my version of CouchDB (1.6.1) returns an empty line in the rows array:

$ http --pretty none http://.../_view/updates
HTTP/1.1 200 OK
Server: CouchDB/1.6.1 (Erlang OTP/17)
(...)

{"total_rows":0,"offset":0,"rows":[

]}

Trying to iterate over the rows using StreamingViewResult.iterator() fails:

org.ektorp.DbAccessException: com.fasterxml.jackson.databind.JsonMappingException: No content to map due to end-of-input at [Source: ; line: 1, column: 0]
        at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:270)
        at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:3838)
        at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3783)
        at com.fasterxml.jackson.databind.ObjectMapper.readTree(ObjectMapper.java:2381)
        at org.ektorp.StreamingViewResult$StreamingViewResultIterator.hasNext(StreamingViewResult.java:121)
        at java.lang.Iterable.forEach(Iterable.java:74)
        (...)

The attached patch skips the empty lines.

[YannRobert]

Thank you.
Would you provide some unit test ?