suppress error?

This function and its friend PrevDQ() work.

If I am diffing goes to next change, or if doing helpgrep will go to
the next.

When at the end of the helpgrep, it presents:
Error detected while processing function NextDQ:
line 4:
E553: No more items
Press ENTER or type command to continue

Can I suppress that message completely?

function! NextDQ()
if &diff
normal! ]c
else
cn
if v:version >= 700
setlocal cursorline
endif
endif
endfun
nmap <F8> :call NextDQ()<cr>

-Bill

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