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Display "None" when a collection is empty

Himanshu Kapoor requested to merge himkp-glql-collection-empty into master

What does this MR do and why?

Display "None" when a collection is empty

In a GLQL rendered table, when a collection, like a list of labels or a list of assignees is empty, display "None" there using the null presenter.

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Before After
image image

How to set up and validate locally

  1. Enable feature flag :glql_integration.
  2. In a project, assign yourself some issues.
  3. Create a wiki page with the following content:
```glql
---
display: table
fields: title, assignees, labels, milestone, epic
---
assignee = none and label = none
```
  1. Save the page.
  2. Notice that the assignees and labels column show "None" instead of being empty.
Edited by Himanshu Kapoor

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