[6.x] Fix error when calculating stack depth for non-existent stack #13606
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This pull request fixes an error when calculating the stack depth for a non-existent stack.
You can reproduce this by editing a Bard/Replicator field. The "Sets" fieldtype contains components with stacks. When you switch to the "Conditions" tab, those stacks are removed from the
stacks.stacks()array. This causes the error in the depth calculation.Fixes #13600