Only show warning when file that is filtered exists

src/calibre/ebooks/conversion/plugins/html_input.py

@@ -269,6 +269,7 @@ class HTMLInput(InputFormatPlugin):
         q = os.path.normcase(get_long_path_name(link))
         if not q.startswith(self.root_dir_of_input):
             if not self.opts.allow_local_files_outside_root:
+                if os.path.exists(q):
                     self.log.warn('Not adding {} as it is outside the document root: {}'.format(q, self.root_dir_of_input))
                 return None, None
         return link, frag