fix: avoid searching all users when many_users is flagged

[mamico]

backport https://github.com/plone/Products.CMFPlone/pull/3845

[coveralls]

Pull Request Test Coverage Report for Build 6275050399

• 1 of 6 (16.67%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 62.8%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/redturtle/volto/monkey.py	1	6	16.67%
<!--	Total:	1	6	16.67%	-->

Totals
Change from base Build 6262756817:	-0.2%
Covered Lines:	758
Relevant Lines:	1207

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💛 - Coveralls

[luca-bellenghi]

@mamico in realtà a me da problemi. su comune di P. dove lo dovevo provare

Traceback (innermost last): Module ZPublisher.WSGIPublisher, line 181, in transaction_pubevents Module ZPublisher.WSGIPublisher, line 390, in publish_module Module ZPublisher.WSGIPublisher, line 285, in publish Module ZPublisher.mapply, line 85, in mapply Module ZPublisher.WSGIPublisher, line 68, in call_object Module Products.CMFPlone.controlpanel.browser.usergroups_groupmembership, line 84, in call Module Products.CMFPlone.controlpanel.browser.usergroups_groupmembership, line 75, in update Module redturtle.volto.monkey, line 133, in getPotentialMembers AttributeError: 'SimpleViewClass from /opt/iocomune.buildout/co' object has no attribute '_old__getPotentialMembers'

[mamico]

@mamico in realtà a me da problemi. su comune di P. dove lo dovevo provare ...

Module redturtle.volto.monkey, line 133, in getPotentialMembers AttributeError: 'SimpleViewClass from /opt/iocomune.buildout/co' object has no attribute '_old__getPotentialMembers'

probabilmente era questo: https://github.com/RedTurtle/redturtle.volto/pull/75/commits/384c086dae04a4dc5915abef2d1d86aea47badeb