dataIndentationChars disregarded if empty string

[Znegl]

Type of report

Bug

Provide detailed reproduction steps (if any)

Set
CKEDITOR.config.dataIndentationChars = '';
Insert a list in the editor.

1. One
2. Two
3. Three

Expected result

What is the expected result of the above steps?

<ol><li>One</li><li>Two</li><li>Three</li></ol>

Actual result

What is the actual result of the above steps?

<ol><li>One</li>\t<li>Two</li>\t<li>Three</li></ol>

Other details

• Browser: Chrome 79.0.3945.117
• OS: macOS 10.15.2 (19C57)
• CKEditor version: 4.11.3
• Installed CKEditor plugins: N/A

I also found this old bug, but can't find any progress on it: https://dev.ckeditor.com/ticket/16949

[jacekbogdanski]

Closed in #3796