exp run: Results cannot be found if experiment name includes space

[lassepe]

Bug Report

Description

When running an experiment with white space in the name, the resulting experiment does not show up in exp show later.

Reproduce

1. `dvc exp run --name "some name": Experiments runs as expected.
2. dvc exp show: Experiment is not listed.

Expected

I would expect that either

• dvc exp run should refuse to assign names with white space in them,
• or dvc exp show shows this experiment in the summary regardless of the white space in the name.

Environment information

Output of dvc doctor:

DVC version: 2.7.2 (pip)
---------------------------------
Platform: Python 3.7.10 on Linux-5.14.5-arch1-1-x86_64-with-arch

[pmrowla]

For reference, the intended behavior is:

dvc exp run should refuse to assign names with white space in them,

Experiment names must be valid Git ref/branch names and cannot contain whitespace (https://git-scm.com/docs/git-check-ref-format)