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reader-node backup panics if no block ever seen on the node #90

@maoueh

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@maoueh
ine 1\n\t/go/pkg/mod/github.com/streamingfast/firehose-core@v1.7.4-0.20250220150850-626a1bba9c0b/launcher/launcher.go:129 +0x6ac\n"}
[2025-03-01 17:18:30.901 EST] INFO (reader-node) chain operator terminated shutting down mindreader app
[2025-03-01 17:18:30.901 EST] INFO (fireeth) all apps terminated gracefully
Error: unable to launch: app "reader-node" panicked: runtime error: invalid memory address or nil pointer dereference
goroutine 89 [running]:
runtime/debug.Stack()
	/usr/local/go/src/runtime/debug/stack.go:26 +0x5e
github.com/streamingfast/firehose-core/launcher.(*Launcher).shutdownIfRecoveringFromPanic(0xc0009ce100, {0x2e99f6d, 0xb}, {0x29461c0, 0x4f90680})
	/go/pkg/mod/github.com/streamingfast/firehose-core@v1.7.4-0.20250220150850-626a1bba9c0b/launcher/launcher.go:217 +0x251
github.com/streamingfast/firehose-core/launcher.(*Launcher).Launch.func3.1()
	/go/pkg/mod/github.com/streamingfast/firehose-core@v1.7.4-0.20250220150850-626a1bba9c0b/launcher/launcher.go:135 +0x4d
panic({0x29461c0?, 0x4f90680?})
	/usr/local/go/src/runtime/panic.go:785 +0x132

------------ ^^^^^ Recovery on panic ^^^^^ ------------

github.com/streamingfast/firehose-core/node-manager/superviser.(*Superviser).LastSeenBlockNum(0xc000bc5a98?)
	/go/pkg/mod/github.com/streamingfast/firehose-core@v1.7.4-0.20250220150850-626a1bba9c0b/node-manager/superviser/superviser.go:148 +0x5c
github.com/streamingfast/firehose-core/node-manager/operator.(*Operator).runCommand(0xc000033cb0, 0xc0008e86c0)
	/go/pkg/mod/github.com/streamingfast/firehose-core@v1.7.4-0.20250220150850-626a1bba9c0b/node-manager/operator/operator.go:259 +0x584
github.com/streamingfast/firehose-core/node-manager/operator.(*Operator).Launch(0xc000033cb0, {0x7ffc0687f179, 0x5}, {0x0, 0x0, 0x0})
	/go/pkg/mod/github.com/streamingfast/firehose-core@v1.7.4-0.20250220150850-626a1bba9c0b/node-manager/operator/operator.go:170 +0x40e
github.com/streamingfast/firehose-core/node-manager/app/node_manager.(*App).Run(0xc000886c80)
	/go/pkg/mod/github.com/streamingfast/firehose-core@v1.7.4-0.20250220150850-626a1bba9c0b/node-manager/app/node_manager/app.go:103 +0x4c5
github.com/streamingfast/firehose-core/launcher.(*Launcher).Launch.func3({0x2e99f6d, 0xb}, {0x34efc00, 0xc000886c80})
	/go/pkg/mod/github.com/streamingfast/firehose-core@v1.7.4-0.20250220150850-626a1bba9c0b/launcher/launcher.go:139 +0x164
created by github.com/streamingfast/firehose-core/launcher.(*Launcher).Launch in goroutine 1
	/go/pkg/mod/github.com/streamingfast/firehose-core@v1.7.4-0.20250220150850-626a1bba9c0b/launcher/launcher.go:129 +0x6ac

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