ignore UnknownHostException

Parsed URLs (especially invalid ones) that cannot be reached should not print an error.

[18:33:06] <justin_>	 http://like.this
[18:33:07] <lordick>	 Error getting url data: java.net.UnknownHostException: like.this
whoops
Merge pull request #2 from wktr/master

Ignore UnknownHostException.