cycle instead of return for single syntax error in comma-separated co…

…nfiguration

Signed-off-by: Marcel Müller <[email protected]>

src/constrain_param.f90

@@ -1310,7 +1310,7 @@ subroutine set_hess(env,key,val,nat,at,idMap,xyz)
             call atl%new(argv(i))
             if (atl%get_error()) then
                call env%warning('something is wrong in the mass list',source)
-               return
+               cycle
             endif
             call atl%to_list(list)
             do idum = 1, size(list)