Strange default text when a empty markdown cell is previewed

[yangql176]

Problem

When preview a empty markdown cell would be like this:

It's very confusing.

Proposed Solution

It should be something more specific OR a empty string.

Additional context

[jtpio]

Thanks @yangql176 for reporting.

Agree this could be confusing to users who haven't typed anything in the cell. Maybe the git history has some more information for why there is such default.

For reference the relevant code is located here:

jupyterlab/packages/cells/src/widget.ts

Line 1742 in 3bef625

const text = (model && model.value.text) || DEFAULT_MARKDOWN_TEXT;

A potential fix would be to remove the DEFAULT_MARKDOWN_TEXT constant, and default to '' instead.