When no historical data is available, show a message instead of blank in estimated days

• Type: Story
• Status: Ready for QA
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: None
• Fix Version/s: Master
• Component/s: AB Testing
• Labels:
  • fc_19_10
  • fc_19_11
  • fc_19_12
• Epic/Theme:
  • AB_Testing
• Epic Link: tango-ab-testing-intuitive-variants
• Sprint: TANGO | SP_22 | Oct17-Oct30, TANGO | SP_23 | Oct30-Nov13, TANGO | SP_24 | Nov13-Nov27, TANGO | SP_25 | Nov27-Dec11
• Git Pull Request: https://github.com/epgarcia/liferay-portal/pull/982

Since this story, AC is not sending any value for the estimated duration of a test when there's no historical data.

Similarly, DXP must show a message explaining why It's not possible to make a prediction.

Design:
To be define

Prerequisites:
Liferay DXP is configured as a data source in AC

Acceptance criteria:

1. There's NO historical data for the test

• Given a Content Page with a AB Test in Draft Status
• And AB Test has NO historical data in AC
• When Reviewing the test
• Then the estimated duration is not shown and the user is informed that this data is not available.

2. There's enough historical data in AC for the test

• Given a Content Page with a AB Test in Draft Status
• And AB Test has enough historical data in AC
• When Reviewing the test
• Then the estimated duration time is shown in days