Remove unused imports and logic

Signed-off-by: alperozturk <alper_ozturk@proton.me>

app/src/main/java/com/owncloud/android/datamodel/FileDataStorageManager.java

@@ -66,8 +66,6 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Locale;
 import java.util.Set;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;

app/src/main/java/com/owncloud/android/datamodel/OCFile.java

@@ -265,11 +265,6 @@ public class OCFile implements Parcelable, Comparable<OCFile>, ServerFileInterfa
         }
 
         if (isFolder()) {
-            if (decryptedRemotePath.equals("/null/")) {
-                Log_OC.d(TAG, "Null folder path found");
-                return remotePath;
-            }
-
             if (decryptedRemotePath.endsWith(PATH_SEPARATOR)) {
                 return decryptedRemotePath;
             } else {

app/src/main/java/com/owncloud/android/ui/activity/FileDisplayActivity.java

@@ -134,7 +134,6 @@ import java.io.File;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
-import java.util.Objects;
 import java.util.Optional;
 
 import javax.inject.Inject;
@@ -149,7 +148,6 @@ import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentTransaction;
 import androidx.localbroadcastmanager.content.LocalBroadcastManager;
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
-import kotlin.Pair;
 import kotlin.Unit;
 
 import static com.owncloud.android.datamodel.OCFile.PATH_SEPARATOR;