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go-pts's Issues

invalid memory address or nil pointer dereference in `UnsubscribeAllPaths`

After switching to go-pts we're getting this panic:

live_tumlive.1.8riczi1h9ebr@vmrbg451    | Error during message reading: websocket: close 1001 (going away)
live_tumlive.1.8riczi1h9ebr@vmrbg451    | [GIN] 2022/12/10 - 11:28:10 | 200 |   12.059828ms |      172.18.0.1 | GET      "/w/HM1FMWuCI/21365/SPLIT"
live_tumlive.1.8riczi1h9ebr@vmrbg451    | Error during message reading: websocket: close 1001 (going away)
live_tumlive.1.8riczi1h9ebr@vmrbg451    | panic: runtime error: invalid memory address or nil pointer dereference
live_tumlive.1.8riczi1h9ebr@vmrbg451    | [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xe034b8]
live_tumlive.1.8riczi1h9ebr@vmrbg451    | 
live_tumlive.1.8riczi1h9ebr@vmrbg451    | goroutine 475 [running]:
live_tumlive.1.8riczi1h9ebr@vmrbg451    | github.com/joschahenningsen/TUM-Live/api.liveUpdateOnUnsubscribe(0xc008a2e9f0)
live_tumlive.1.8riczi1h9ebr@vmrbg451    | 	/go/src/app/api/live_update.go:55 +0xd8
live_tumlive.1.8riczi1h9ebr@vmrbg451    | github.com/mono424/go-pts.(*Channel).UnsubscribeAllPaths(0xc0001d40e0, {0xc007274f60?, 0xc004a1ce18?})
live_tumlive.1.8riczi1h9ebr@vmrbg451    | 	/go/pkg/mod/github.com/mono424/[email protected]/channel.go:128 +0x71
live_tumlive.1.8riczi1h9ebr@vmrbg451    | github.com/mono424/go-pts.(*ChannelStore).UnsubscribeAll(...)
live_tumlive.1.8riczi1h9ebr@vmrbg451    | 	/go/pkg/mod/github.com/mono424/[email protected]/channel_store.go:81
live_tumlive.1.8riczi1h9ebr@vmrbg451    | github.com/mono424/go-pts.(*TubeSystem).disconnectHandler(0xc00007b798?, 0xc004a1ce70?)
live_tumlive.1.8riczi1h9ebr@vmrbg451    | 	/go/pkg/mod/github.com/mono424/[email protected]/tube_system.go:84 +0x85
live_tumlive.1.8riczi1h9ebr@vmrbg451    | github.com/mono424/go-pts.(*Connector).Leave(0xc00007b780, {0xc007274f60?, 0x4f128e?})
live_tumlive.1.8riczi1h9ebr@vmrbg451    | 	/go/pkg/mod/github.com/mono424/[email protected]/connector.go:55 +0x4f
live_tumlive.1.8riczi1h9ebr@vmrbg451    | github.com/mono424/go-pts-gorilla-connector.NewConnector.func1.2.1()
live_tumlive.1.8riczi1h9ebr@vmrbg451    | 	/go/pkg/mod/github.com/mono424/[email protected]/gorilla_connector.go:33 +0xb2
live_tumlive.1.8riczi1h9ebr@vmrbg451    | github.com/mono424/go-pts-gorilla-connector.NewConnector.func1.2()
live_tumlive.1.8riczi1h9ebr@vmrbg451    | 	/go/pkg/mod/github.com/mono424/[email protected]/gorilla_connector.go:44 +0x13b
live_tumlive.1.8riczi1h9ebr@vmrbg451    | created by github.com/mono424/go-pts-gorilla-connector.NewConnector.func1
live_tumlive.1.8riczi1h9ebr@vmrbg451    | 	/go/pkg/mod/github.com/mono424/[email protected]/gorilla_connector.go:27 +0x11e

Are we using this correctly or is there an issue with the library? Regardless, in nil cases we should always return an error instead of panicking.

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