Backport of configs: Fix module loader nil pointer panic into v1.2 #31112
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Backport
This PR is auto-generated from #31060 to be assessed for backporting due to the inclusion of the label 1.2-backport.
The below text is copied from the body of the original PR.
In configurations which have already been initialized, updating the source of a non-root module call to an invalid value could cause a nil pointer panic. This commit fixes the bug and adds test coverage.
Fixes #31056.