fix: panic if no volumes have analytics enabled #3323
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time=2024-11-25T16:21:54.877+05:30 level=ERROR source=collector.go:305 msg="Collector panicked" Poller=fsx collector=RestPerf:Volume err="runtime error: invalid memory address or nil pointer dereference\n" stack="goroutine 126 [running]:\nruntime/debug.Stack()\n\t/opt/homebrew/opt/go/libexec/src/runtime/debug/stack.go:26 +0x64\ngithub.com/netapp/harvest/v2/cmd/poller/collector.(*AbstractCollector).Start.func1()\n\t/Users//GolandProjects/harvest/cmd/poller/collector/collector.go:308 +0x108\npanic({0x1031b1500?, 0x10366af40?})\n\t/opt/homebrew/opt/go/libexec/src/runtime/panic.go:785 +0xf0\ngithub.com/netapp/harvest/v2/cmd/collectors/restperf/plugins/volumetopmetrics.(*TopMetrics).processTopClients(0x140001739a0, 0x0)\n\t/Users//GolandProjects/harvest/cmd/collectors/restperf/plugins/volumetopmetrics/volumetopmetrics.go:247 +0x2c\ngithub.com/netapp/harvest/v2/cmd/collectors/restperf/plugins/volumetopmetrics.(*TopMetrics).Run(0x140001739a0, 0x14002064690)\n\t/Users//GolandProjects/harvest/cmd/collectors/restperf/plugins/volumetopmetrics/volumetopmetrics.go:193 +0x2b8\ngithub.com/netapp/harvest/v2/cmd/poller/collector.(*AbstractCollector).Start(0x1400059e240, 0x140003fc5a0)\n\t/Users//GolandProjects/harvest/cmd/poller/collector/collector.go:472 +0x2b68\ncreated by main.(*Poller).Start in goroutine 1\n\t/Users//GolandProjects/harvest/cmd/poller/poller.go:516 +0x1cc\n"