[OE-core] [PATCH 1/1] combo-layer: handle unset dest_dir in sanity_check()

[Patrick Ohly]

Please ignore, I accidentally resent this pull request.

On Tue, 2015-08-04 at 18:20 +0200, Patrick Ohly wrote:
> The previous "clean up dest_dir checking" patch (f8cdbe7497) improved
> handling of empty dest_dir but made handling of unset dest_dir worse:
> instead showing the "Option dest_dir is not defined for component ..."
> error, it fails with a Python exception.

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