[Merge] Suggest pull when asked to merge into an empty branch

[Martin Pool]

On 31 Jan 2007, Henry Ludemann <misc at hl.id.au> wrote:
> Suggest pull when asked to merge into an empty branch.
> 
> Merging to an empty tree fails (see bug 82555 for testcase and attempted
> fixes).
> 
> This is just a bundle that suggests to the user that 'pull' might be a
> better option...

Hello

Thankyou for the analysis in the bug report.

I think giving this message would be a good first step.  Is this the
best place for the change though?  It seems a bit redundant with the
check which is already done inside merge.  If it's an interim fix it's
maybe ok.

-- 
Martin