BUGFIX: Fix marginalized parameter reconstruction with pool

@cjhaster pointed out that the marginalized parameter reconstruction with a pool was broken in a recent commit as a generator is returned instead of tuple. This MR explicitly casts the returned quantity to a tuple.

added Bug Conversion labels

changed milestone to %1.2.0

I'll just add here that after I've implemented the fix contained in this MR, the issue of the broken pool is resolved and the parameter reconstruction can proceed as it should.

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• 330e7ef4...602eaa64 - 6 commits from branch master
• ffc49978 - Merge remote-tracking branch 'origin/master' into bugfix-marginalized-pool-reconstruction

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mentioned in commit fb9ee616