fix inspector gadget SoapClient dependency

library/ZendAfi/Controller/Plugin/InspectorGadget.php

@@ -36,7 +36,8 @@ class ZendAfi_Controller_Plugin_InspectorGadget extends Zend_Controller_Plugin_A
 
     $this->beEnabled();
     Class_WebService_SIGB_AbstractService::setLogger($this);
-    Class_WebService_MappedSoapClient::setLogger($this);
+    if (class_exists('SoapClient'))
+      Class_WebService_MappedSoapClient::setLogger($this);
   }