panic on .htsf malformed file

[tmornini]

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x6123ba]

goroutine 10 [running]:
main.messageFromFile(0xc4200e4820, 0x0, 0xc4201b2730, 0x0)
	/go/src/github.com/tmornini/http-spec/type-message.go:52 +0x1ea
main.responseFromFile(0xc4200e4820, 0xc4200ea2f0, 0x0, 0x0)
	/go/src/github.com/tmornini/http-spec/type-message-response.go:6 +0x2f
main.specTripletIterator(0xc4200e4820)
	/go/src/github.com/tmornini/http-spec/03-spec-triplet-iterator.go:17 +0xc6
main.specFileProcessor(0x0, 0x0, 0x0, 0x0, 0x0, 0xee6b280, 0x0, 0x0, 0x14, 0x7fff3b524ce2, ...)
	/go/src/github.com/tmornini/http-spec/02-spec-file-processor.go:52 +0x439
created by main.specFileScatter
	/go/src/github.com/tmornini/http-spec/01-spec-file-scatterer.go:10 +0x10d