Description of the problem

Interpolate bads silently ignores ecog and seeg channels.

Steps to reproduce

import mne

misc_path = mne.datasets.misc.data_path()

raw = mne.io.read_raw(misc_path / 'ecog' / 'sample_ecog_ieeg.fif')
raw.info['bads'] = ['G10', 'G51']
raw.load_data()
raw.interpolate_bads()

Link to data

No response

Expected results

Channels should be interpolated

Actual results

Setting channel interpolation method to {}.
<ipython-input-10-fe35daf7ae7f>:2: RuntimeWarning: No bad channels to interpolate. Doing nothing...

Additional information

I think for ecog the existing spherical interpolation is reasonable. Perhaps seeg should interpolate per lead but I think raising a NotImplementedError would be more helpful.