BUG: POV with negitve value throws exc

src/main/java/caosdb/server/query/POV.java

@@ -329,7 +329,7 @@ public class POV implements EntityFilterInterface {
         query.getConnection().prepareCall("call initPOVRefidsTable(?,?)")) {
       // stmt = this.connection.prepareCall("call initPOV(?,?,?,?,?)");
       // initPOVRefidsTable(in vInt INT, in vText VARCHAR(255))
-      if (this.vInt != null) {
+      if (this.vInt != null && this.vInt > 0) {
         stmt.setInt(1, this.vInt);
       } else {
         stmt.setNull(1, Types.INTEGER);