[epiphany/gnome-3-32] Fix password manager when there is no username

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 8ab62818895e96f1ac13be3003b5f7019dea5d42
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sun Apr 28 22:48:02 2019 +0000

    Fix password manager when there is no username
    
    We should autofill passwords even if the form has no username.
    
    
    (cherry picked from commit b1a938523e2a02687af25d9df6edd90a56795762)

 embed/web-extension/resources/js/ephy.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/embed/web-extension/resources/js/ephy.js b/embed/web-extension/resources/js/ephy.js
index 8ee5d6569..874aad9af 100644
--- a/embed/web-extension/resources/js/ephy.js
+++ b/embed/web-extension/resources/js/ephy.js
@@ -329,7 +329,9 @@ Ephy.PasswordManager = class PasswordManager
     {
         let element = this._takePendingPromise(id)
         if (element) {
-            if (username !== '' && password !== '')
+            if (username === '')
+                username = null;
+            if (password !== '')
                 element.resolver({username, password});
             else
                 element.resolver(null);