dockerfile: fix panic on warnings with multi-platform #3505
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fixes #3495
On multi-platform builds warning as disabled for secondary platforms to avoid duplicates, but nil value can cause a panic.
Regression from ec9a3ac#diff-c876ea8bd639239ba60cde8cc40c2c2dd761f361564d4465b139b7b628e815bbR481
Signed-off-by: Tonis Tiigi tonistiigi@gmail.com