issues that were discovered during biohackathon 2019 in Paris

pathvisio/src/main/java/lcsb/mapviewer/wikipathway/model/biopax/BiopaxFactory.java

@@ -2,6 +2,7 @@ package lcsb.mapviewer.wikipathway.model.biopax;
 
 import java.util.*;
 
+import org.apache.commons.lang3.StringUtils;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -31,7 +32,11 @@ public class BiopaxFactory {
       if (publication.getId() == null || publication.getId().equals("")) {
         return null;
       } else {
-        return new MiriamData(MiriamRelationType.BQ_BIOL_IS_DESCRIBED_BY, MiriamType.PUBMED, publication.getId());
+        if (StringUtils.isNumeric(publication.getId().trim())) {
+          return new MiriamData(MiriamRelationType.BQ_BIOL_IS_DESCRIBED_BY, MiriamType.PUBMED, publication.getId());
+        } else {
+          return null;
+        }
       }
     } else {
       throw new NotImplementedException("Unknown biopax database: " + publication.getDb());