Panic in client.go:102 when remote write given nil URL.

[tomwilkie]

From: https://groups.google.com/forum/#!msg/prometheus-users/ty8tRkLpm3A/YHEvye7gBAAJ

# Remote write configuration (for Graphite, OpenTSDB, or InfluxDB).

remote_write:

  - url: "https://192.168.0.219/write"
#    scheme: https
  - tls_config:
      insecure_skip_verify: true

INFO[0000] Starting prometheus (version=1.7.1, branch=master, revision=3afb3fffa3a29c3de865e1172fb740442e9d0133)  source="main.go:88"
INFO[0000] Build context (go=go1.8.3, user=root@0aa1b7fc430d, date=20170612-11:44:05)  source="main.go:89"
INFO[0000] Host details (Linux 4.2.0-27-generic #32~14.04.1-Ubuntu SMP Fri Jan 22 15:32:26 UTC 2016 x86_64 amu-opr01 (none))  source="main.go:90"
INFO[0000] Loading configuration file prometheus.yml     source="main.go:252"
INFO[0000] Loading series map and head chunks...         source="storage.go:428"
INFO[0000] 0 series loaded.                              source="storage.go:439"
INFO[0000] Starting target manager...                    source="targetmanager.go:63"
INFO[0000] Listening on :9090                            source="web.go:259"
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x166a1e1]

goroutine 158 [running]:
github.com/prometheus/prometheus/storage/remote.(*Client).Store(0xc4203c7000, 0xc42233c800, 0x64, 0x80, 0x0, 0x0)
        /go/src/github.com/prometheus/prometheus/storage/remote/client.go:102 +0x671
github.com/prometheus/prometheus/storage/remote.(*shards).sendSamplesWithBackoff(0xc42052d7c0, 0xc42233c800, 0x64, 0x80)
        /go/src/github.com/prometheus/prometheus/storage/remote/queue_manager.go:492 +0xbb
github.com/prometheus/prometheus/storage/remote.(*shards).sendSamples(0xc42052d7c0, 0xc42233c800, 0x64, 0x80)
        /go/src/github.com/prometheus/prometheus/storage/remote/queue_manager.go:479 +0x6d
github.com/prometheus/prometheus/storage/remote.(*shards).runShard(0xc42052d7c0, 0x0)
        /go/src/github.com/prometheus/prometheus/storage/remote/queue_manager.go:465 +0x28c
created by github.com/prometheus/prometheus/storage/remote.(*shards).start
        /go/src/github.com/prometheus/prometheus/storage/remote/queue_manager.go:415 +0x54

[lock]

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