Refactor: Cleanup code

CityDoctorParent/Extensions/CityDoctorZipLoader/src/main/java/de/hft/stuttgart/citydoctor2/ziploader/ErroneousEntry.java

@@ -3,20 +3,20 @@ package de.hft.stuttgart.citydoctor2.ziploader;
 import de.hft.stuttgart.citydoctor2.datastructure.CityDoctorModel;
 
 import java.util.zip.ZipEntry;
-import java.util.zip.ZipFile;
 
 public class ErroneousEntry extends CityGmlZipEntry {
 
-
-
     private ZipEntryErrorType errorType = null;
 
     public ErroneousEntry(ZipEntry entry, ZipEntryErrorType errorType){
         super(entry);
+        this.errorType = errorType;
     }
 
     @Override
-    public void validateModel(){}
+    public void validateModel(){
+        /* Erroneous entries could not parse their CityModel and thus skip validation */
+    }
 
     @Override
     public CityDoctorModel getModel(){