Check for empty bounding boxes in boolean op filter

src/ifcgeom/IfcGeomFunctions.cpp

@@ -262,11 +262,19 @@ namespace {
 		Bnd_Box A;
 		BRepBndLib::Add(a, A);
 
+		if (A.IsVoid()) {
+			return;
+		}
+
 		TopTools_ListIteratorOfListOfShape it(b);
 		for (; it.More(); it.Next()) {
 			Bnd_Box B;
 			BRepBndLib::Add(it.Value(), B);
 
+			if (B.IsVoid()) {
+				continue;
+			}
+
 			if (A.Distance(B) < p) {
 				c.Append(it.Value());
 			}