When using forms, hide the right widgets

If all widgets inside a product frame becomes invisible after a form change,
hide their frames.

This is a regression from commit 47a2bbb3c8b1f80ac5b239050da5c8018cb7b8ed. That
commit changed a single label to 3 frames, and those label names were not
available anymore.

Change-Id: I904d64557e1cbe91c414a3f472f9dc8ab76050a8
(cherry picked from commit 36731a740ae83d21ef79e4d47e423fdd1e3e3d78)