improved Apk.toString() for easier debugging

app/src/main/java/org/fdroid/fdroid/data/Apk.java

@@ -270,7 +270,7 @@ public class Apk extends ValueObject implements Comparable<Apk>, Parcelable {
 
     @Override
     public String toString() {
-        return packageName + " (version " + versionCode + ")";
+        return toContentValues().toString();
     }
 
     public ContentValues toContentValues() {

app/src/main/java/org/fdroid/fdroid/installer/InstallerFactory.java

@@ -41,12 +41,12 @@ public class InstallerFactory {
      */
     public static Installer create(Context context, Apk apk) {
         if (apk == null || TextUtils.isEmpty(apk.packageName)) {
-            throw new IllegalArgumentException("packageName must not be empty!");
+            throw new IllegalArgumentException("Apk.packageName must not be empty: " + apk);
         }
 
         Installer installer;
         if (apk.packageName.equals(PrivilegedInstaller.PRIVILEGED_EXTENSION_PACKAGE_NAME)) {
-            // special case for "F-Droid Privileged Extension"
+            // special case for installing "Privileged Extension" with root
             installer = new ExtensionInstaller(context, apk);
         } else if (PrivilegedInstaller.isDefault(context)) {
             Utils.debugLog(TAG, "privileged extension correctly installed -> PrivilegedInstaller");