Fix ungroup.

Normand Briere

2019-06-29 a69bb4474a3264a9a7a7f8b8d8154ea771f167c8

 Vertex.java
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@@ -122,7 +122,7 @@
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     public boolean equals(Object o)
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     {
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-            assert(norm.normalized());
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+    // JUNE 2019. norm can be null (e.g. Box)           Grafreed.Assert(norm.normalized());
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         //if (true) return false;
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         Vertex vert = (Vertex) o;