missing user URI for an album panics about smugmug

[bzimmer]

Same issue with node.

~/Development/src/github.com/bzimmer/smugmug (34-missing-user) > ma ls node 7CMcv
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x13044ac]

goroutine 1 [running]:
github.com/bzimmer/smugmug.(*NodeService).expand(0xc00019f758, 0xc000456240, 0x1359c00)
        /Users/bzimmer/Development/pkg/mod/github.com/bzimmer/[email protected]/node.go:66 +0x2c
github.com/bzimmer/smugmug.(*NodeService).node(0xc000124140, 0x1)
        /Users/bzimmer/Development/pkg/mod/github.com/bzimmer/[email protected]/node.go:48 +0x7b
github.com/bzimmer/smugmug.(*NodeService).Node(0xc000124140, {0x146df50, 0xc000114000}, {0x7ffeefbff563, 0x10}, {0xc0001241f0, 0x1, 0x1})
        /Users/bzimmer/Development/pkg/mod/github.com/bzimmer/[email protected]/node.go:111 +0x116
github.com/bzimmer/smugmug.(*NodeService).WalkN(0x2, {0x146df50, 0xc000114000}, {0x7ffeefbff563, 0x5}, 0xc000128d80, 0xffffffffffffffff, {0xc0001241f0, 0x1, 0x1})
        /Users/bzimmer/Development/pkg/mod/github.com/bzimmer/[email protected]/node.go:203 +0x1a5
github.com/bzimmer/ma.node(0xc000128d40)
        /Users/bzimmer/Development/src/github.com/bzimmer/ma/ls.go:65 +0x305
github.com/urfave/cli/v2.(*Command).Run(0xc00013ca20, 0xc000128980)
        /Users/bzimmer/Development/pkg/mod/github.com/urfave/cli/[email protected]/command.go:163 +0x64a
github.com/urfave/cli/v2.(*App).RunAsSubcommand(0xc000117380, 0xc000128840)
        /Users/bzimmer/Development/pkg/mod/github.com/urfave/cli/[email protected]/app.go:434 +0x9a6
github.com/urfave/cli/v2.(*Command).startApp(0xc00013c7e0, 0xc000128840)
        /Users/bzimmer/Development/pkg/mod/github.com/urfave/cli/[email protected]/command.go:278 +0x713
github.com/urfave/cli/v2.(*Command).Run(0xc000128840, 0x7ffeefbff55b)
        /Users/bzimmer/Development/pkg/mod/github.com/urfave/cli/[email protected]/command.go:94 +0x7bc
github.com/urfave/cli/v2.(*App).RunContext(0xc000117040, {0x146df50, 0xc000114000}, {0xc000128040, 0x4, 0x4})
        /Users/bzimmer/Development/pkg/mod/github.com/urfave/cli/[email protected]/app.go:313 +0x81e
main.main()
        /Users/bzimmer/Development/src/github.com/bzimmer/ma/cmd/ma/main.go:173 +0xef6

[bzimmer]

Tested a patch with ma:

~/Development/src/github.com/bzimmer/ma (main) > ./dist/ma ls node 7CMcv
2021-10-24T15:27:44-07:00 INF ls albumKey=WJvpCp imageCount=19 name="SmugMug's green hair" nodeID=7CMcv type=Album
2021-10-24T15:27:44-07:00 INF counters count=1 metric=ma.ls.node
~/Development/src/github.com/bzimmer/ma (main) > ./dist/ma ls album WJvpCp               
2021-10-24T15:28:01-07:00 INF ls albumKey=WJvpCp imageCount=19 name="SmugMug's green hair" nodeID=7CMcv type=Album
2021-10-24T15:28:01-07:00 INF counters count=1 metric=ma.ls.album