Remove empty members box in Mermaid class diagram

[ParanoidUser]

Ahoy, @koppor! 👋

I know it's been so long that you probably lost hope of it ever happening. Last year, Mermaid v11.4 introduced a new diagram renderer that allows to hide empty boxes in class diagrams. Fast-forward to just last week, GitHub finally upgraded their markdown viewer to incorporate these changes. Now, we can hide those eye-catching boxes we discussed in PR #43 a year ago.

New Class Diagram

---
  config:
    class:
      hideEmptyMembersBox: true
---
classDiagram
  direction TB
  class ADR {
    <<abstract>>
  }
  ADR <|-- MADR
  ADR <|-- NygardADR
  ADR <|-- Y-Statement
  ADR <|-- OtherADRTemplate

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[koppor]

@ParanoidUser Thank you so much for the follow-up! I totally forgot about it and I am very happy that it is in now!