Make more user-friendly exception about that spider could not process relative url
Make more user-friendly exception about that spider could not process relative url

kevinlondon/grab,lorien/grab,alihalabyah/grab,huiyi1990/grab,giserh/grab,istinspring/grab,alihalabyah/grab,subeax/grab,codevlabs/grab,huiyi1990/grab,pombredanne/grab-1,SpaceAppsXploration/grab,pombredanne/grab-1,subeax/grab,liorvh/grab,SpaceAppsXploration/grab,shaunstanislaus/grab,DDShadoww/grab,raybuhr/grab,maurobaraldi/grab,shaunstanislaus/grab,codevlabs/grab,lorien/grab,giserh/grab,liorvh/grab,subeax/grab,DDShadoww/grab,raybuhr/grab,maurobaraldi/grab,kevinlondon/grab,istinspring/grab