importing fails when Daz subitems are grouped

[Luke Graybill]

Importing fails with an IndexError when subitems of the character (eg, clothing) are grouped in Daz:

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(using commit 387a707 of plugin)

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Import process gets to about 20%, then shows orange error at bottom and the following error in Blender info window:

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[Thomas Larsson]

Fixed in latest commit.

Since the group node becomes an empty in Blender, this is also a case where the Eliminate Empties tool is useful. I changed the semantics so that every selected and visible empty is deleted. This means that you can do Merge Rigs and Eliminate Empties in any order, and get rid of the extra empty in both cases.

[Luke Graybill]

Good fix, thank you again Thomas!