Nil reference exception importing what seems to be a valid CSV

[oscarbatori]

I tried to import some data as follows:

(liquidata-etl) [oscarbatori:coin_metrics(oscarbatori/coin-metrics)] >> dolt table import -c --pk date,ticker eod_data ../../initial_data.csv 
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x19e1a42]

goroutine 1 [running]:
github.com/liquidata-inc/dolt/go/libraries/doltcore/table/untyped/csv.getColHeaders(0xc0002fc180, 0xc000320080, 0x40000, 0xc0005aa000, 0xc000316010, 0x0, 0x0)
        /Users/oscarbatori/Documents/dolt/go/libraries/doltcore/table/untyped/csv/reader.go:95 +0x192
github.com/liquidata-inc/dolt/go/libraries/doltcore/table/untyped/csv.NewCSVReader(0x3094858, 0x257ec40, 0xc000316010, 0xc000320080, 0xc000316010, 0x0, 0x0)
        /Users/oscarbatori/Documents/dolt/go/libraries/doltcore/table/untyped/csv/reader.go:63 +0xba
github.com/liquidata-inc/dolt/go/libraries/doltcore/table/untyped/csv.OpenCSVReader(0x3094858, 0x7ffeefbff63f, 0x16, 0x36214c0, 0x30e38c0, 0xc000320080, 0x0, 0x0, 0x0)
        /Users/oscarbatori/Documents/dolt/go/libraries/doltcore/table/untyped/csv/reader.go:57 +0xa7
github.com/liquidata-inc/dolt/go/libraries/doltcore/mvdata.FileDataLocation.NewReader(0x7ffeefbff63f, 0x16, 0x224fcbf, 0x4, 0x25970c0, 0xc000302180, 0xc000318060, 0x36214c0, 0x30e38c0, 0x0, ...)
        /Users/oscarbatori/Documents/dolt/go/libraries/doltcore/mvdata/file_data_loc.go:95 +0x1de
github.com/liquidata-inc/dolt/go/libraries/doltcore/mvdata.NewDataMover(0x25970c0, 0xc000302180, 0xc000318060, 0x25b1d00, 0x30e38c0, 0xc0003941b0, 0x22b85e8, 0x0, 0x0)
        /Users/oscarbatori/Documents/dolt/go/libraries/doltcore/mvdata/data_mover.go:103 +0x141
github.com/liquidata-inc/dolt/go/cmd/dolt/commands/tblcmds.executeMove(0x25970c0, 0xc000302180, 0xc000306000, 0xc0000f0000, 0xc0003941b0, 0x5)
        /Users/oscarbatori/Documents/dolt/go/cmd/dolt/commands/tblcmds/import.go:359 +0x151
github.com/liquidata-inc/dolt/go/cmd/dolt/commands/tblcmds.ImportCmd.Exec(0x25970c0, 0xc000302180, 0xc0002f0120, 0x11, 0xc0000f0030, 0x5, 0x5, 0xc000306000, 0x11)
        /Users/oscarbatori/Documents/dolt/go/cmd/dolt/commands/tblcmds/import.go:268 +0xcf
github.com/liquidata-inc/dolt/go/cmd/dolt/cli.SubCommandHandler.Exec(0x22519bf, 0x5, 0x229b196, 0x3f, 0xc0003d0000, 0x5, 0x5, 0x25970c0, 0xc000302180, 0xc0004747b0, ...)
        /Users/oscarbatori/Documents/dolt/go/cmd/dolt/cli/command.go:149 +0x4e1
github.com/liquidata-inc/dolt/go/cmd/dolt/cli.SubCommandHandler.Exec(0x22502a7, 0x4, 0x2262b13, 0x11, 0xc0002aa000, 0x1c, 0x1c, 0x2597040, 0xc0000c8000, 0x22502a7, ...)
        /Users/oscarbatori/Documents/dolt/go/cmd/dolt/cli/command.go:149 +0x4e1
main.runMain(0x0)
        /Users/oscarbatori/Documents/dolt/go/cmd/dolt/dolt.go:181 +0xa44
main.main()
        /Users/oscarbatori/Documents/dolt/go/cmd/dolt/dolt.go:89 +0x22

Hit me up for the file, as it's too large to attach this issue (36.4 MB, it's not huge).

[oscarbatori]

This is in fact caused by the following:

$ cat sample.csv
,c1,c2
1,a,b
2,c,d

Which in turn causes the following:

dolt table import -c --pk c1 test sample.csv
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x19e1a42]
.
.
.

So we just need a better error message, which probably involves catching this before a Nil pointer exception.