safety check on throwable catch

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1907660 13f79535-47bb-0310-9956-ffa450edef68

poi/src/main/java/org/apache/poi/util/XMLHelper.java

@@ -318,7 +318,7 @@ public final class XMLHelper {
         try {
             property.accept(name, value);
             return true;
-        } catch (Exception|Error e) {
+        } catch (Throwable e) {
             if (ExceptionUtil.isFatal(e)) {
                 ExceptionUtil.rethrow(e);
             }