Empty cards attributes are ignored

The same works in tryCard, so something must be flattening them somehow.

With the attached branch I was able to get all the expected combinations to work.

There's one caveat though: first row is the king. That's what decides on column widths for the whole set of attributes.

To achieve a 1 per line effect, you need to remember that you need to also send the trailing empty attributes, otherwise it'll lay out 3 in a row.

Works great, thanks!

This bug was fixed in the package unity8 - 8.00+14.10.20140827.2-0ubuntu1

---------------
unity8 (8.00+14.10.20140827.2-0ubuntu1) utopic; urgency=low

  [ Michał Sawicz ]
  * Implement scope header customization options
  * Don't ignore empty attributes in CardAttributes.qml and improve its
    encapsulation (LP: #1355901)
  * Add support for preview button color customization. Deprecate
    support for action icons.
  * Add table preview widget
  * Make "See Less" get stuck at the bottom of the view
  * Support alternative navigation in the dash.
  * Add scope settings UI
  * Add scope favoriting support
  * Passcode, not PIN (LP: #1361114)

  [ Jussi Pakkanen ]
  * Use nullptr instead of NULL.

  [ Albert Astals ]
  * Add table preview widget
  * Make "See Less" get stuck at the bottom of the view
  * Support alternative navigation in the dash.
  * Make the PageHeaderLabelTest pass under valgrind

  [ Benjamin Zeller ]
  * Add support for scope:// url in the dash (LP: #1361349)

  [ Marcus Tomlinson ]
  * Handle the openScope signal in "tempScopeItem" (ScopesOverview.qml)
    as is done with "scopeItem" (Dash.qml) (LP: #1356410)

  [ Daniel d'Andrada ]
  * Make "See Less" get stuck at the bottom of the view

  [ Andrea Cimitan ]
  * Fix right padding on overlay card
  * Add scope settings UI

  [ Michael Zanetti ]
  * use a smaller asset for the app's dropshadow (LP: #1359157)
 -- Ubuntu daily release <email address hidden> Wed, 27 Aug 2014 15:37:05 +0000

This bug was fixed in the package unity8 - 8.00+14.10.20140827.2-0ubuntu1

---------------
unity8 (8.00+14.10.20140827.2-0ubuntu1) 14.09; urgency=low

  [ Michał Sawicz ]
  * Implement scope header customization options
  * Don't ignore empty attributes in CardAttributes.qml and improve its
    encapsulation (LP: #1355901)
  * Add support for preview button color customization. Deprecate
    support for action icons.
  * Add table preview widget
  * Make "See Less" get stuck at the bottom of the view
  * Support alternative navigation in the dash.
  * Add scope settings UI
  * Add scope favoriting support
  * Passcode, not PIN (LP: #1361114)

  [ Jussi Pakkanen ]
  * Use nullptr instead of NULL.

  [ Albert Astals ]
  * Add table preview widget
  * Make "See Less" get stuck at the bottom of the view
  * Support alternative navigation in the dash.
  * Make the PageHeaderLabelTest pass under valgrind

  [ Benjamin Zeller ]
  * Add support for scope:// url in the dash (LP: #1361349)

  [ Marcus Tomlinson ]
  * Handle the openScope signal in "tempScopeItem" (ScopesOverview.qml)
    as is done with "scopeItem" (Dash.qml) (LP: #1356410)

  [ Daniel d'Andrada ]
  * Make "See Less" get stuck at the bottom of the view

  [ Andrea Cimitan ]
  * Fix right padding on overlay card
  * Add scope settings UI

  [ Michael Zanetti ]
  * use a smaller asset for the app's dropshadow (LP: #1359157)
 -- Ubuntu daily release <email address hidden> Wed, 27 Aug 2014 15:37:05 +0000

I needed to have a second attribute display on a new line so I added the center tuple (with Value as empty string) and the result was that only first attribute displays instead of the final attribute (time_s) displaying on a new line as I wanted:

        us::VariantBuilder attrs;
        attrs.add_tuple({
            {"value", us::Variant(date_s.toStdString())}
        });
        attrs.add_tuple({
            {"value", us::Variant("")}
        });
        attrs.add_tuple({
            {"value", us::Variant(time_s.toStdString())}
        });
        res["attributes"] = attrs.end()

phablet@ubuntu-phablet:/tmp$ apt-cache policy libunity-scopes3
libunity-scopes3:
  Installed: 0.6.4+14.10.20140828.1-0ubuntu

learned on irc one needs to have declare the attributes like this:
"attributes": {"field": "attributes", "max-count": 4},

And then have a tuple with an empty "Value" key to act I guess like a newline, like this, which works:
        us::VariantBuilder attrs;
        attrs.add_tuple({
            {"value", us::Variant(date_s.toStdString())}
        });
        attrs.add_tuple({
            {"value", us::Variant("")}
        });
        attrs.add_tuple({
            {"value", us::Variant(time_s.toStdString())}
        });
        attrs.add_tuple({
            {"value", us::Variant("")}
        });
        res["attributes"] = attrs.end()