If I understand this correctly: this is about having the option to create a histogram range ballot with no default value selected when someone wants to vote.

I had a look into it and for me the current situation looks like this:
While creating the ballot, there is the option to set a default value but it is not required.
You can create it without setting a default value. If a default value is given, the value is set but if there is no default value given nothing is preselected if a user wants to vote.

I understand that the goal of this ticket has already been achieved, but if I have misunderstood something, I would be grateful if I could get some more information so that I can solve the problem.

I created a poll with no default value and this is how the ballot looks like if I want to vote:

In T326412#9641675, @Miriamin wrote:

[...]
I understand that the goal of this ticket has already been achieved, but if I have misunderstood something, I would be grateful if I could get some more information so that I can solve the problem.

I created a poll with no default value and this is how the ballot looks like if I want to vote:

Interesting. I just did similar on my local install of SecurePoll and got this:

I wonder if you are using "+1" and "-1" as maximum and minimum scores, or "+1" and "0"? It looks like SecurePoll adds the 0 to fill the gap. I assume it would probably add other integers if the min and max were e.g. -5 and +5. I think using +1 and 0 is fine, since in histogram range votes we manually adjudicate the percentages anyway, and don't use the score provided by the tally output directly.

I do wonder how those "blank" votes work out in the tally. The system does not seem to warn me when I submit a totally blank vote and I wonder if that vote even counts at all?

In T326412#9643631, @jrbs wrote:

I do wonder how those "blank" votes work out in the tally. The system does not seem to warn me when I submit a totally blank vote and I wonder if that vote even counts at all?

Ah, it seems it does, since I get the "You have voted in this election before." note as expected. Unfortunately I can't run the tally because of a (probably unrelated) error on my own wiki ([6cc28f00199fe52b2379f75e] /index.php/Special:SecurePoll/tally/120 TypeError: Return value of MediaWiki\Extension\SecurePoll\Ballots\Ballot::getUserLang() must be an instance of Language, null returned)

Yes - I used minimum value "0" and maximum value "1" because if you create the range "-1" to "1" it will add "0". Also if you select "-5" and "5" it will add all integers in between, including "0".
I tested what happens if you don't vote anything: For the ballot with "0" and "1" it was tallied with "0". I also checked this with a ballot including numbers "1" and "2" - then its not possible to submit a blank vote, so blank is always counted with "0" in this case.

Ah, it seems it does, since I get the "You have voted in this election before." note as expected. Unfortunately I can't run the tally because of a (probably unrelated) error on my own wiki ([6cc28f00199fe52b2379f75e] /index.php/Special:SecurePoll/tally/120 TypeError: Return value of MediaWiki\Extension\SecurePoll\Ballots\Ballot::getUserLang() must be an instance of Language, null returned)

I had this error as well - but did a local quickfix by returning any language to test the tallying - but I don't if the issue is related or not.

Ah! I tested this myself and it does already seem possible even if the options are "0" and "1", as long as the option to require votes is selected. So I think indeed this task is already resolved.

The actual error box is quite ugly, but that would I think require another task to resolve.