reaction glyph always contain reaction line (sometimes only empty line)

converter-sbml/src/main/java/lcsb/mapviewer/converter/model/sbml/reaction/SbmlReactionExporter.java

 package lcsb.mapviewer.converter.model.sbml.reaction;
 
 import java.awt.geom.Line2D;
+import java.awt.geom.Point2D;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
@@ -244,7 +245,13 @@ public class SbmlReactionExporter extends SbmlBioEntityExporter<Reaction, org.sb
 
       assignStyleToGlyph(reactionGlyph, style);
     }
-
+    if (reactionGlyph.getCurve().getCurveSegmentCount()==0) {
+      LineSegment segment = new LineSegment();
+      Point2D point = reaction.getReactants().get(0).getLine().getEndPoint();
+      segment.setStart(new Point(point.getX(), point.getY()));
+      segment.setEnd(new Point(point.getX(), point.getY()));
+      reactionGlyph.getCurve().addCurveSegment(segment);
+    }
   }
 
   private LocalStyle createStyleForModifier(Modifier modifier) {