When creating more than one new data point and cloning into an empty group,

[wsloand]

This may be related to #73.

When I created two new data points in a group and replaced them both with cloned data points, left the group, and came back in, a data point with a field name "Untitled Annotation" and an empty value was in the group.

Steps:

1. Create a group
2. Click "+ New Data"
3. Click the clone button on the new data point and clone an existing data point
4. Click "+ New Data"
5. Click the clone button on the new data point and clone a different existing data point
6. Leave the group
7. Come back in

Result: Two cloned data points and one "Untitled Annotation" are in the group.

Expected result: Two cloned data points and nothing else are in the group.

[wsloand]

Looks good