A dashboard name can be removed completely

[madalincm]

Issue Summary:

Build identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0
Window 7 64 Bit

Steps to Reproduce:

1. Open STMO homepage - https://pipeline-sql.stage.mozaws.net/
2. Open a published dashboard page
3. Go to options - Edit Dashboard and delete the dashboard name
4. Save the results

Expected results:

The dashboard name can't be empty

Actual results:

The dashboard name can be empty

Notes/Issues:

Verified in FF53(Win7). Issue can be reproduced in STMO-stage a
Screencast for this issue:

[madalincm]

Not sure if the fix hit stage so far. I'm still able to reproduce this in stage.
Example of new dashboard having an empty name: https://pipeline-sql.stage.mozaws.net/dashboard/testdashboard

[alison985]

After the rebase in #82, I can't reproduce this locally.

[madalincm]

I can't reproduce it in stage (verified in Win7 x64, FF54)
I can't no longer remove a dashboard name but the save button is still clickable after removing the name. After user removes the name and tries to click the save button the button should not be active or a warning message should be displayed.
Please view this screencast: