Regression; Eclair crashes if 'group_by' is nil.

[simnalamburt]

Before, Eclair did not group the items at all if config.group_by options were nil. But now, Eclair crashes if config.group_by is nil.

I'm not sure if it is intended backward compatibility breakage, or an unintended regression. But still, I thought past behavior was quite convinient, so I hereby report this as an issue.

See also

• https://github.com/devsisters/eclair/commit/4c025c4a1614ee3997807f33577f32f4d6012e3f/?diff=unified#r26673591