parameters: (s)
return_statement: return escape(s)
docstring: Like :func:`escape` but converts `None` into an empty
      markup string.
docstring_summary: Like :func:`escape` but converts `None` into an empty
      markup string.
docstring_tokens: Like : func : escape but converts None into an empty markup string .
function: def escape_silent(s):
      """Like :func:`escape` but converts `None` into an empty
      markup string.
      """
      if s is None:
          return Markup()
      return escape(s)
function_tokens: def escape_silent ( s ) : if s is None : return Markup ( ) return escape ( s )