stats: handle websites with no logs and no history

Signed-off-by: Mattia Rizzolo <mapreri@ubuntu.com>

scripts/stats.ubuntu-it.org

@@ -32,7 +32,12 @@ for dir in "${logdirs[@]}"; do
         echo "Generating stats for ${sitename}..."
             if [[ ! -s "$dir/access.log" ]]; then
                 echo "+ access.log for $sitename is empty, reusing the last analysis."
-                cp "/srv/stats.ubuntu-it.org/current/${sitename}.html" "${deploy}/${sitename}.html"
+                oldfile="/srv/stats.ubuntu-it.org/current/${sitename}.html"
+                if [ -f "$oldfile" ]; then
+                    cp "$oldfile" "${deploy}/${sitename}.html"
+                else
+                    echo "+ previous file for $sitename not available, probably a very new website."
+                fi
                 continue
             fi
         # blackhole stderr because that's where the progress counter goes,