This removes the horizontal scrolling bar when an error occurs.  An
error may be rendered for various reason, one of which is viewing the
summary for a repo that doesn't have any tags, or for a genuine error
condition.

I've tested diff below both against repos without tags and with
artificial errors injected like this:

    --- gotwebd/gotweb.c
    +++ gotwebd/gotweb.c
    @@ -156,6 +156,11 @@ gotweb_process_request(struct request *c)
     		goto render;
     	}
     
    +	if (1) {
    +		error2 = got_error(GOT_ERR_QUERYSTRING);
    +		goto render;
    +	}
    +
     	if (qs->action != INDEX) {
     		error = gotweb_init_repo_dir(&repo_dir, qs->path);
     		if (error)

the page seems to be rendered fine in either case.  Make sure to clear
the browser cache when testing.

ok?


diff /home/op/w/got
commit - 3bf00f2542ea6e7825f52c155e5f3f5fecb136e3
path + /home/op/w/got
blob - 7ee40c3b69dbf14194f2d61478622267175c57c1
file + gotwebd/files/htdocs/gotwebd/gotweb.css
--- gotwebd/files/htdocs/gotwebd/gotweb.css
+++ gotwebd/files/htdocs/gotwebd/gotweb.css
@@ -301,7 +301,6 @@ body {
 #err_content {
 	clear: left;
 	float: left;
-	width: 100%;
 	padding-left: 20px;
 	padding-top: 20px;
 	padding-bottom: 20px;