Feature Request: [Web UI] Show assertion details when using assert-set

[sjsinju]

Thank you for adding #765 (assert-set) and #903 (__threshold for csv). 👍

But I found an issue while using it.
I thought below should be shown same behavior.

a.yaml

- vars:
      abc: "test"
- assert:
      type: assert-set
      threshold: 0.5
      assert:
        - type: python
          value: "file://a.py"
        - type: python
          value: "file://b.py

a.csv

abc	__expected1	__expected2	__threshold
test	file://a.py	file://b.py	0.5

But I got results on Web UI

1. for a.yaml : Just shown Aggregate score 1 > 0.5 threshold in overview and detail view
   

2. for a.csv : Aggregate score 1 > 0.5 threshold in overview is same with a.yaml, but detail view shows pass/fail details for all of assertions

Is this the intended result?
I think 1 should also show assertions details in detail view same as 2. If no, could you explain this differences?