mothra: clicking on the url scroll bar, snarfing, or saving a hit when no urls have been loaded (right after running mothra) would crash. this was due to use of w->url and selection when they are actually nil.

to fix this, make genwww return 0 if w->url is nil and output an error message when attempting to access selection if it's nil. the problem with the w->url fix is that after clicking on the url scroll bar, an empty url history row could be highlighted by clicking on it. fix this by making sure lp->lo is not less than zero.

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