Trigger claimview widget's error handling out of claimlistview

Correctly resolves the error if an API error occurs when adding a completely new claim.

- patch set 2: Made displayError public
- patch set 3: Removed $ variable prefix for error anchor

Change-Id: I170f93b33a5fc33c3e04be34a82e9e8aef8b4de3
Merge "Trigger claimview widget's error handling out of claimlistview"