Reset should not trigger setDefaultException error (#50)

Author: KDederichs

Diff for: CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## 1.4.0 -
 
+### Fixed
+- `reset()` should not trigger `setDefaultException` error condition
+
+### Breaking
 - drop support for PHP 5 and 7.0
 
 ## 1.3.1 - 2019-11-06

Diff for: src/Client.php

@@ -176,7 +176,7 @@ public function addException(\Exception $exception)
      */
     public function setDefaultException(\Exception $defaultException = null)
     {
-        if (!$defaultException instanceof Exception) {
+        if (null !== $defaultException && !$defaultException instanceof Exception) {
             @trigger_error('Clients may only throw exceptions of type '.Exception::class.'. Setting an exception of class '.get_class($defaultException).' will not be possible anymore in the future', E_USER_DEPRECATED);
         }
         $this->defaultException = $defaultException;