How do I block the message "Pattern not found" in :s

I've written a couple of functions which change the formatting of C++ code, to bring it in line with our coding guidelines; things along the lines of:

function! FixParen()
s/( */( /g
s/ *)/ )/g
s/( *)/()/g
endfunction

The problem is that when calling these over a range (the usual procedure), vim invokes the function once per line; a lot of lines don't have anything which needs fixing, and cause the message "Pattern not found" to be emitted. Is there any way of inhibiting this?

--
James

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