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If a "copy" field type is set, and the value is an empty string and "display_label" is set to false, the field key is still written into the element. Not a big issue, but it seems inconsistent, and even setting the "label" to empty doesn't correct this.
'some_field' => array('type' => 'copy', 'tag' => 'div', 'value' => '', 'id' => 'some-field', 'row_class' => 'some-row-name', 'display_label' => FALSE, 'label' => '');
The above will still echo out "some_field"