Remove unwanted links

[hackrush01]

The parser is currently parsing some invalid links such as javascript:;. Those should not be scraped.

[poulomihore]

The issue has been resolved in the commit fe25ba5

[Compro-Prasad]

"in the commit crawler1.py". crawler1.py is a file, not a commit. Kindly edit your comment specifying the commit id or the github link to the commit.