changed default session value to null instead of false

Author: glena

src/Auth0.php

@@ -273,7 +273,7 @@ private function exchangeCode() {
      */
     public function getUser() {
         // Ensure we have the user info
-        if ($this->user === false) {
+        if ($this->user === null) {
             $this->exchangeCode();
         }
         if (!is_array($this->user)) {
@@ -352,7 +352,7 @@ public function setAccessToken($access_token) {
      * @return string
      */
     final public function getAccessToken() {
-        if ($this->access_token === false) {
+        if ($this->access_token === null) {
             $this->exchangeCode();
         }
         return $this->access_token;
@@ -381,7 +381,7 @@ public function setIdToken($id_token) {
      * @return string
      */
     final public function getIdToken() {
-        if ($this->id_token === false) {
+        if ($this->id_token === null) {
             $this->exchangeCode();
         }
         return $this->id_token;

src/Store/EmptyStore.php

@@ -23,7 +23,7 @@ class EmptyStore
     public function set($key, $value) {
     }
 
-    public function get($key, $default=false) {
+    public function get($key, $default=null) {
         return $default;
     }
 

src/Store/SessionStore.php

@@ -65,7 +65,7 @@ public function set($key, $value) {
      *
      * @return mixed
      */
-    public function get($key, $default=false) {
+    public function get($key, $default=null) {
         $key_name = $this->getSessionKeyName($key);
 
         if (isset($_SESSION[$key_name])) {