Fix issue 1582 (#1604)

Author: samtstern

auth/src/main/java/com/firebase/ui/auth/ui/email/RecoverPasswordActivity.java

@@ -109,15 +109,16 @@ protected void onFailure(@NonNull Exception e) {
 
     @Override
     public void onClick(View view) {
-        if (view.getId() == R.id.button_done
-                && mEmailFieldValidator.validate(mEmailEditText.getText())) {
+        if (view.getId() == R.id.button_done) {
             onDonePressed();
         }
     }
 
     @Override
     public void onDonePressed() {
-        mHandler.startReset(mEmailEditText.getText().toString());
+        if (mEmailFieldValidator.validate(mEmailEditText.getText())) {
+            mHandler.startReset(mEmailEditText.getText().toString());
+        }
     }
 
     private void showEmailSentDialog(String email) {

auth/src/main/java/com/firebase/ui/auth/viewmodel/email/RecoverPasswordHandler.java

@@ -15,7 +15,7 @@ public RecoverPasswordHandler(Application application) {
         super(application);
     }
 
-    public void startReset(final String email) {
+    public void startReset(@NonNull final String email) {
         setResult(Resource.<String>forLoading());
         getAuth().sendPasswordResetEmail(email)
                 .addOnCompleteListener(new OnCompleteListener<Void>() {