Error when no makefile found

[raymondbutcher]

It panics when it should error normally.

raymond@raymond-desktop:~$ remake
make: *** No targets specified and no makefile found.  Stop.
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0x4c771f]

goroutine 7 [running]:
github.com/raymondbutcher/remake/makedb.(*Database).GetTarget(0xc000104da8, {0x0, 0xc00000c108})
        /home/runner/work/remake/remake/makedb/database.go:98 +0x5f
github.com/raymondbutcher/remake/makedb.(*Database).GetPendingTargets(0xc00002a480, {0x0, 0x21cd6b0}, {0x1bd5a80ba3af8, 0xc000104de8, 0x5ba680})
        /home/runner/work/remake/remake/makedb/database.go:108 +0x55
github.com/raymondbutcher/remake/makecmd.(*Cmd).getRemaining(0xc00002a480)
        /home/runner/work/remake/remake/makecmd/cmd.go:127 +0x3e
github.com/raymondbutcher/remake/makecmd.(*Cmd).UpdateProgress(0xc00002a480)
        /home/runner/work/remake/remake/makecmd/cmd.go:93 +0x53
github.com/raymondbutcher/remake/makecmd.(*Cmd).StartGraceMode(0xc00002a480, 0x0, 0xc0000780c0, 0xc000078180)
        /home/runner/work/remake/remake/makecmd/grace.go:82 +0x2fc
main.remake({0x0, 0x0}, 0x0)
        /home/runner/work/remake/remake/main.go:105 +0x7a
created by main.main
        /home/runner/work/remake/remake/main.go:88 +0x414