bugfix: add missing empty constructor for Algorithm which is needed for JSON de-serialization

src/main/java/eu/hbp/mip/model/Algorithm.java

@@ -10,6 +10,10 @@ public class Algorithm extends ExperimentValidator {
 
     private boolean validation;
 
+    public Algorithm() {
+
+    }
+
     public Algorithm(String code, String name, boolean validation) {
         this.validation = validation;
         setCode(code);