Metadata entry not filled should show null

[longshuicy]

When a non-required metadata entry not filled, it should show "null" instead of the metadata entry name.

The text box should be empty and not show the default value.

[ddey2]

Right now, I don't even see the metadata which are empty. It will only list the metadata which has values.

I have 3 metadata definitions created but I only see 1metadata which is filled in.

@lmarini I think we show show them. Should I modify this issue to show all the metadata?

[ddey2]

I see this when I click on "Add Metadata". There is shows 'latitude' and longitude which are the field names. We show the field names only there.

We don't show empty metadata under "User Metadata" tab anymore. If an user wishes to enter the metadata, the user clicks on "Add metadata" and can see all the available metadata he/she wishes to fill in

[ddey2]

we might want to decide how we want to proceed with this. I think if there is no metadata available, we should not just show null entries.