Swap Exception for Throwable, to skip a wider range of problems (eg GAE) when attempting to set an xml security manager as best we can

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1650290 13f79535-47bb-0310-9956-ffa450edef68

src/ooxml/java/org/apache/poi/util/DocumentHelper.java

@@ -80,8 +80,8 @@ public final class DocumentHelper {
                 documentBuilderFactory.setAttribute("http://apache.org/xml/properties/security-manager", mgr);
                 // Stop once one can be setup without error
                 return;
-            } catch (Exception e) {
-                logger.log(POILogger.WARN, "SAX Security Manager could not be setup", e);
+            } catch (Throwable t) {
+                logger.log(POILogger.WARN, "SAX Security Manager could not be setup", t);
             }
         }
     }