`progress` raises an exception when an empty list is passed

[mplough-kobold]

Describe the issue:

Expected results: progress returns immediately with 0 seconds elapsed and 100% completion.
Actual results: An exception is raised.

Minimal Complete Verifiable Example:

from dask.distributed import Client, progress
c = Client()
progress([])

Anything else we need to know?:

Environment:

• Dask version: 2025.7.0
• Python version: 3.12.12
• Operating System: Debian Trixie
• Install method (conda, pip, source): uv (i.e. from PyPI)