Inconsistent behavior of "hideEmptyMembersBox" option

[vdusek]

Description

When using the Mermaid configuration hideEmptyMembersBox: true, the behavior is inconsistent:

• Expected behavior: Empty rows should not render in the diagram, regardless of whether the class contains only attributes, only methods, or neither.
• Actual behavior: Rows are hidden only when the class contains neither attributes nor methods. If a class has only attributes or only methods, an empty row is rendered, which is unexpected.

Steps to reproduce

Chart code:

---
config:
  class:
    hideEmptyMembersBox: true
---

classDiagram

class Class1 {
    + a
    + foo()
}

class Class2 {
    + a
}

class Class3 {
    + foo()
}

class Class4

Renderes into:

As I said, I would expect the empty rows not to be rendered.