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ipam: Do not deref nil in GET /ipinfo/tracker if tracker doesn't exist #3408
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In some cases, we do not create any IPAM tracker, which leads to a panic when GET'ing /ipinfo/tracker.
rade
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bboreham
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Sep 25, 2018
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In some cases, we do not create any IPAM tracker, which leads to a panic when GET'ing /ipinfo/tracker.
Fixes #3405.