checkstyle: don't allow multiple empty lines

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

@@ -329,7 +329,6 @@ public class AppDetails extends AppCompatActivity implements ProgressListener, A
     private final Context mctx = this;
     private Installer installer;
 
-
     private AppDetailsHeaderFragment mHeaderFragment;
 
     /**
@@ -553,7 +552,6 @@ public class AppDetails extends AppCompatActivity implements ProgressListener, A
 
     }
 
-
     @Override
     public Object onRetainCustomNonConfigurationInstance() {
         inProcessOfChangingConfiguration = true;
@@ -665,7 +663,6 @@ public class AppDetails extends AppCompatActivity implements ProgressListener, A
         return true;
     }
 
-
     private void tryOpenUri(String s) {
         Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(s));
         if (intent.resolveActivity(mPm) == null) {

F-Droid/src/org/fdroid/fdroid/localrepo/peers/WifiPeer.java

@@ -51,7 +51,6 @@ public class WifiPeer implements Peer {
         return shouldPromptForSwapBack;
     }
 
-
     @Override
     public int describeContents() {
         return 0;

F-Droid/src/org/fdroid/fdroid/net/bluetooth/BluetoothServer.java

@@ -195,7 +195,6 @@ public class BluetoothServer extends Thread {
 
         }
 
-
         private Response respond(Map<String, String> headers, String uri) {
             // Remove URL arguments
             uri = uri.trim().replace(File.separatorChar, '/');

config/checkstyle/checkstyle.xml

@@ -42,7 +42,7 @@
         <module name="Indentation" />
         <module name="EmptyLineSeparator">
             <property name="allowNoEmptyLineBetweenFields" value="true" />
-            <!--<property name="allowMultipleEmptyLines" value="false" />-->
+            <property name="allowMultipleEmptyLines" value="false" />
         </module>
         <module name="SeparatorWrap">
             <property name="tokens" value="COMMA" />