Fix panic in subscriber.Statistics #7318
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The tags passed into Statistics() calls are not supposed to be modified. The balanceWriter in subscribers tried to modify them triggering a panic because they can be nil.
jsternberg
approved these changes
Sep 16, 2016
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The tags passed into Statistics() calls are not supposed to be modified.
The balanceWriter in subscribers tried to modify them triggering a panic
because they can be nil.
Fixes a regression introduced in #7177
cc @jsternberg @e-dard