hack to keep polyline invariant in component-splitting, should be corrected by HC later on

git-svn-id: http://www.openflipper.org/svnrepo/OpenFlipper/branches/Free@17785 383ad7c9-94d9-4d36-a494-682f7c89f535

ObjectTypes/PolyLine/PolyLineT.cc

@@ -2024,7 +2024,14 @@ split_into_one_per_component(MeshT &_mesh,
     }
 
     if (current_polyLine.n_vertices() >= 2)
-        out_polylines.push_back(current_polyLine);
+      out_polylines.push_back(current_polyLine);
+
+    // hack! if no splitting return original polyline
+    if(out_polylines.size() <= 1)
+    {
+      out_polylines.clear();
+      out_polylines.push_back(*this);
+    }
 }
 
 //=============================================================================