[MRG] Fix ica.plot_sources exception

[bloyl]

What does this implement/fix?

ica.exclude = [0]
ica.plot_sources(raw, picks=[1, 2])

would raise an exception.

RuntimeError: bad channel(s) ['ICA000'] marked do not exist in info

Also fixed a typo in ctf.io

I don't think either of these have made it to release so no whats new.

closes #8966

[larsoner]

Just a heads up that the pip 3.9 and pip pre builds are broken currently, feel free to ignore them

[drammock]

Looks like this does not actually fix the problem:
https://25470-1301584-gh.circle-artifacts.com/0/dev/auto_examples/preprocessing/plot_run_ica.html#sphx-glr-auto-examples-preprocessing-plot-run-ica-py

I'll take a closer look.

[drammock]

The example looks correct now: https://25473-1301584-gh.circle-artifacts.com/0/dev/auto_examples/preprocessing/plot_run_ica.html#sphx-glr-auto-examples-preprocessing-plot-run-ica-py

But I don't think the change to the test file is actually testing what we want it to, so don't merge until after I've updated that (off to a meeting now)

[bloyl]

Sorry I should have been clearer. My commits were intended to just fix the behavior in the PR description and in the test, not the issue opened (#8966).

Your commits seem to close that issue as well. Thanks!

[drammock]

Sorry I should have been clearer.

I think this was a case of me not reading carefully enough :)

Anyway I think now both problems are fixed.

[drammock]

thanks @bloyl !