Move catching of liquid errors in include tags

The previous code only caught render-time errors. This change
makes it catch parse-time errors as well, such as unknown tags.

lib/jekyll/tags/include.rb

@@ -95,12 +95,10 @@ eos
 
         context.stack do
           context['include'] = parse_params(context) if @params
-          begin
+          partial.render!(context)
-            partial.render!(context)
-          rescue => e
-            raise IncludeTagError.new e.message, File.join(INCLUDES_DIR, @file)
-          end
         end
+      rescue => e
+        raise IncludeTagError.new e.message, File.join(INCLUDES_DIR, @file)
       end
 
       def validate_dir(dir, safe)