Improve Error handling of sample app

import android.util.Log;

import android.widget.TextView;

import androidx.annotation.Nullable;

import androidx.appcompat.app.AppCompatActivity;

import com.google.gson.GsonBuilder;

import com.nextcloud.android.sso.AccountImporter;

import com.nextcloud.android.sso.api.NextcloudAPI;

import com.nextcloud.android.sso.exceptions.AndroidGetAccountsPermissionNotGranted;

import com.nextcloud.android.sso.exceptions.NextcloudFilesAppNotInstalledException;

import java.io.IOException;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import androidx.annotation.Nullable;

import androidx.appcompat.app.AppCompatActivity;

import retrofit2.NextcloudRetrofitApiBuilder;

public class MainActivity extends AppCompatActivity {

                                        serverInfo.capabilities.theming.name,

                                        serverInfo.version.semanticVersion))

                        );

                    } catch (IOException e) {

                    } catch (Exception e) {

                        runOnUiThread(() -> ((TextView) findViewById(R.id.result)).setText(e.getMessage()));

                        e.printStackTrace();

                    }