panic querying CSI plugins

[tgross]

On nightly (built from last night's master):

Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]:     2020-08-13T14:40:42.396Z [ERROR] http: http: panic serving 100.19.30.237:61544: assignment to entry in nil map
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]: goroutine 10675 [running]:
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]: net/http.(*conn).serve.func1(0xc0003caa00)
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]:         net/http/server.go:1772 +0x139
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]: panic(0x2b80ae0, 0x38177f0)
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]:         runtime/panic.go:973 +0x396
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]: github.com/hashicorp/nomad/command/agent.structsAllocListStubToApi(0xc0011d8f20, 0xc00100df20)
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]:         github.com/hashicorp/nomad/command/agent/csi_endpoint.go:423 +0x404
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]: github.com/hashicorp/nomad/command/agent.structsCSIPluginToApi(0xc000c5b180, 0xc00100ad80)
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]:         github.com/hashicorp/nomad/command/agent/csi_endpoint.go:299 +0x447
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]: github.com/hashicorp/nomad/command/agent.(*HTTPServer).CSIPluginSpecificRequest(0xc000326b90, 0x38edee0, 0xc00100ad80, 0xc001328200, 0x4d7086, 0x5f3550ea, 0x179f92e6, 0x758b0becfe)
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]:         github.com/hashicorp/nomad/command/agent/csi_endpoint.go:265 +0x351
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]: github.com/hashicorp/nomad/command/agent.(*HTTPServer).wrap.func1(0x38edee0, 0xc00100ad80, 0xc001328200)
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]:         github.com/hashicorp/nomad/command/agent/http.go:448 +0x176
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]: net/http.HandlerFunc.ServeHTTP(0xc0006663c0, 0x38edee0, 0xc00100ad80, 0xc001328200)
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]:         net/http/server.go:2012 +0x44
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]: net/http.(*ServeMux).ServeHTTP(0xc00004e600, 0x38edee0, 0xc00100ad80, 0xc001328200)
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]:         net/http/server.go:2387 +0x1a5
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]: github.com/NYTimes/gziphandler.GzipHandlerWithOpts.func1.1(0x38f7f60, 0xc000204460, 0xc001328200)
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]:         github.com/NYTimes/[email protected]/gzip.go:277 +0x1e6
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]: net/http.HandlerFunc.ServeHTTP(0xc0006b60c0, 0x38f7f60, 0xc000204460, 0xc001328200)
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]:         net/http/server.go:2012 +0x44
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]: net/http.serverHandler.ServeHTTP(0xc0002040e0, 0x38f7f60, 0xc000204460, 0xc001328200)
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]:         net/http/server.go:2807 +0xa3
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]: net/http.(*conn).serve(0xc0003caa00, 0x3909ea0, 0xc001002ac0)
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]:         net/http/server.go:1895 +0x86c
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]: created by net/http.(*Server).Serve
Aug 13 14:40:42 ip-172-31-93-242 nomad[13410]:         net/http/server.go:2933 +0x35c

[tgross]

Fixed in #8666, we'll get this rolled out with the next patch.

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