title: fetchSignInMethodsForEmail gives an empty email field on a TOAST
body: <p>I have a pretty simple challenge here USING firebase Auth by email. I
  first check if the email exists which is working well. but the program
  gives me a toast of "Please enter email..." Check me code
  below.</p>
  
  <p>Should proceed next if the email does not exist. when email does not
  exist. my  <code>(TextUtils.isEmpty(email))</code>  toast to me to enter the
  email.</p>
  
  <pre><code>public class RegistreActivity extends AppCompatActivity {
      EditText e4;
      FirebaseAuth auth;
      String email;
      ProgressDialog dialog;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_registre);
          e4 =(EditText)findViewById(R.id.temail);
          auth= FirebaseAuth.getInstance();
      }
      public  void  goToPasswordActivity(View v){    
          auth.fetchSignInMethodsForEmail(e4.getText().toString())
              .addOnCompleteListener(new OnCompleteListener&lt;SignInMethodQueryResult&gt;() {
                  @Override
                  public void onComplete(@NonNull Task&lt;SignInMethodQueryResult&gt; task) {
                      if (task.isSuccessful()){
  
                          boolean check =!task.getResult().getSignInMethods().isEmpty();
                          if (!check){
                              Intent intent = new Intent(RegistreActivity.this,PasswordActivity.class);
                              intent.putExtra("email",e4.getText().toString());
                              startActivity(intent);    
                          }
                          else {    
                              Toast.makeText(getApplicationContext(),"email alredy exst",Toast.LENGTH_LONG).show();
                          }
                          if (TextUtils.isEmpty(email)) {
                              Toast.makeText(getApplicationContext(), "Please enter email...", Toast.LENGTH_LONG).show();
                              return;
                          }    
                      }    
                  }
              });    
          }    
  }
  </code></pre>