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Segmentation fault with particular URL

I've tried using your library with the following url

http://www.capital.bg/politika_i_ikonomika/bulgaria/2017/02/17/2919580_zashto_izstinaha_trubite_na_toplofikaciia_sofiia/

And it crashed with a segfault panic:

$ ./go-summarizer "http://www.capital.bg/politika_i_ikonomika/bulgaria/2017/02/17/2919580_zashto_izstinaha_trubite_na_toplofikaciia_sofiia/"
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x38 pc=0xa5377]

goroutine 1 [running]:
panic(0x286e00, 0xc4200100c0)
	/usr/local/go/src/runtime/panic.go:500 +0x1a1
github.com/ktodorov/go-summarizer/helpers.replaceBrs(0xc420243420, 0x2d2fec, 0x4, 0xc420243420)
	/Users/iron4o/gopath/src/github.com/ktodorov/go-summarizer/helpers/htmlHelper.go:275 +0x77
github.com/ktodorov/go-summarizer/helpers.getMainInfoFromHTML(0xc42021e000, 0x1ac00, 0xc42021e000, 0x1ac00, 0x0, 0x0, 0x0, 0x28, 0x2a3380, 0xc420132380, ...)
	/Users/iron4o/gopath/src/github.com/ktodorov/go-summarizer/helpers/htmlHelper.go:369 +0x134
github.com/ktodorov/go-summarizer/helpers.ExtractMainInfoFromURL(0x7fff5fbffa18, 0x78, 0x12, 0x0, 0x0, 0x0, 0x0, 0xa0, 0x2fa1ed, 0x2fa1ec, ...)
	/Users/iron4o/gopath/src/github.com/ktodorov/go-summarizer/helpers/urlHelper.go:30 +0xf7
github.com/ktodorov/go-summarizer.(*Summarizer).GetMainTextFromURL(0xc42004bed8, 0x90, 0xa0, 0xc4200ab0e0, 0x0)
	/Users/iron4o/gopath/src/github.com/ktodorov/go-summarizer/summarizer.go:72 +0x66
github.com/ktodorov/go-summarizer.(*Summarizer).Summarize(0xc42004bed8, 0x10e38, 0xa0, 0xc42009b658, 0x1)
	/Users/iron4o/gopath/src/github.com/ktodorov/go-summarizer/summarizer.go:44 +0x1f3
main.main()
	/Users/iron4o/playfield/go-summarizer/main.go:15 +0xb6

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