ul.83 is not a direct ancestor of cmm.85, so I would like to know what
code is creating a mcd between those two and why..

The warning about serializing empty mcz is there because we never
found the bug which was serializing empty mcz's.  This warning is help
us identify when and why it occurs, and also to prevent the bug from
silently storing an empty mcz into the repository, possibly losing
code and/or causing harm to trunk.

On Sun, Apr 24, 2016 at 10:12 AM, Levente Uzonyi <leves at caesar.elte.hu> wrote:
> In this case the code in ul-83 and cmm-85 is the same, so the diff is
> expected to be empty.
> I wonder why is there a warning in such cases.
>
> Levente
>
>
> On Sun, 24 Apr 2016, Bernhard Pieber wrote:
>
>> Dear fellow Squeakers,
>>
>> Here we go again. When I try to update the latest Squeak5.1-15113.image
>> from http://ftp.squeak.org/5.1alpha using the latest CogSpur.r3684 on OS X
>> with an empty package-cache I run into the Warning "About to serialize an
>> empty diffy version.“ This time with SMLoader-cmm.85(ul.83).mcd. I wonder if
>> I am the only one.
>>
>> Cheers,
>> Bernhard
>>
>>> Am 07.08.2014 um 19:52 schrieb Eliot Miranda <eliot.miranda at gmail.com>:
>>>
>>> Hi Guys,
>>>
>>>     source.squeak.org/trunk's Morphic-eem.740(cmm.739).mcd is empty.  How
>>> do we fix it?
>>>
>>> On a related note is there any way to get the updater to download full
>>> packages, avoiding the diffy versions?  e.g a preference?
>>> --
>>> best,
>>> Eliot
>>>
>>
>>
>
>
>