clock-app crashes easily when editing/adding alarms

this is plaguing me for a while on my N4 running devel channel; still happening on latest promoted image: #179.

reproduce:

 1. open clock app with an existing alarm already set
 2. change or add new time for alarm
 3. save
 4. observe it very often crashing during save
 4a. observe it very often crashing after save, when the alarm clock page reloads the data

If this doesnt happen on first try, try a few times and it will surely happen. Big blocker for my personal dogfooding of touch being my only phone.

Interesting observation that might be related is that sometimes if i edit an existing alarm it doesnt have the HOUR and MINUTE so i cannot even edit it ... e.g. it displays purely ":"; maybe related as a cause or result of the crashes during save.

If you need anything and don't see me answering quick enough, i am always on IRC as asac in #ubuntu-touch; if asleep will come back when awake on IRC or here as you need.

Let me know if you need further info, but the repro instructions should be easy above.

Thanks!