Constant Hairpin on line break

[Karim Haddad]

Hi,

Does somebody know how to avoid having the vertical hook on a line break and 
just to have it on the end of a constant hairpin ?
Here is a minimal example code :

\relative c'' {
 \override Hairpin.stencil = #constante-hairpin
  c1 \p \< |
  \break
  c1 | %%here the hook should not appear if possible.
  c1 \! |
  }

Best regards
-- 
Karim Haddad