Replace size() == 0 with is_empty().
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@ -520,7 +520,7 @@ Error SkinTool::_determine_skeleton_roots(
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skeleton->roots = roots;
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if (roots.size() == 0) {
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if (roots.is_empty()) {
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return FAILED;
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} else if (roots.size() == 1) {
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return OK;
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