Remove unnecessary initializers

These fields are initialized to their zero values (0, null, false) so doing
the same over in the constructor is unnecessary.

F-Droid/src/org/fdroid/fdroid/RepoXMLHandler.java

@@ -58,9 +58,6 @@ public class RepoXMLHandler extends DefaultHandler {
 
     public RepoXMLHandler(Repo repo) {
         this.repo = repo;
-        signingCertFromIndexXml = null;
-        name = null;
-        description = null;
     }
 
     public List<App> getApps() {

F-Droid/src/org/fdroid/fdroid/data/Apk.java

@@ -44,15 +44,7 @@ public class Apk extends ValueObject implements Comparable<Apk> {
     public String repoAddress;
     public Utils.CommaSeparatedList incompatibleReasons;
 
-    public Apk() {
-        size = 0;
-        added = null;
-        repo = 0;
-        hash = null;
-        hashType = null;
-        permissions = null;
-        compatible = false;
-    }
+    public Apk() { }
 
     public Apk(Cursor cursor) {