Fix dashcards misalignment with empty link box
Fix dashcards misalignment with empty link box

closes: CNVS-28047

When a dashcard has all the links disabled it would misalign with the rest
of the dashcards. This fixes that.

Test Plan:
- Add more than 6 courses/dashcards
- On one of those courses go into Settings > Navigation and disable
all of the navigation items
- Go back to dashcards, the cards should still be all aligned
Example screen - http://cl.ly/1M0x0y2N1k0b

Change-Id: Id4d1c09391222a58cfa69bd9948c50d1fe7544d4
Reviewed-on: https://gerrit.instructure.com/74575
Tested-by: Jenkins
Reviewed-by: Jennifer Stern <7e594e5cba47371ac9ee694a84b9d94f9f6ec815@instructure.com>
Product-Review: Jennifer Stern <7e594e5cba47371ac9ee694a84b9d94f9f6ec815@instructure.com>
QA-Review: Pedro Fajardo <121b528f0c2f2e923ce3103793aca31b9a662ac4@instructure.com>

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