Ensure that empty array is stripped in getAccessToken

This maintains the previous behaviour where an uninitialised access token
would return null.

Author: Ian Barber

src/Google/Client.php

@@ -250,7 +250,7 @@ public function getAccessToken()
     // The response is json encoded, so could be the string null.
     // It is arguable whether this check should be here or lower
     // in the library.
-    return (null == $token || 'null' == $token) ? null : $token;
+    return (null == $token || 'null' == $token || '[]' == $token) ? null : $token;
   }
 
   /**

tests/general/ApiClientTest.php

@@ -48,6 +48,12 @@ public function testPrepareInvalidScopes() {
     $this->assertEquals("", $scopes);
   }
 
+  public function testNoAuthIsNull() {
+    $client = new Google_Client();
+
+    $this->assertNull($client->getAccessToken());
+  }
+
   public function testPrepareService() {
     $client = new Google_Client();
     $client->setScopes(array("scope1", "scope2"));