Resolve "sbml layout should be compliant with copasi tool"

Closes #654 (closed)

converter-CellDesigner/src/main/java/lcsb/mapviewer/converter/model/celldesigner/species/SpeciesSbmlParser.java

@@ -161,6 +161,9 @@ public class SpeciesSbmlParser extends AbstractElementXmlParser<CellDesignerSpec
     }
     species.setInitialAmount(getNodeAttr("initialAmount", spieciesNode));
     species.setInitialConcentration(getNodeAttr("initialConcentration", spieciesNode));
+    if (species.getInitialAmount() == null && species.getInitialConcentration() == null) {
+      species.setInitialConcentration(0.0);
+    }
     species.setCharge(getNodeAttr("charge", spieciesNode));
     species.setOnlySubstanceUnits(getNodeAttr("hasOnlySubstanceUnits", spieciesNode));
     species.setBoundaryCondition(getNodeAttr("boundaryCondition", spieciesNode));