Fix mod4+[1-9] in default rc.lua

The old code had flaws:
* If the tag chnaged screen, the code was unstable.
* If awful.tag.del was used, then it displayed an error
* If tags were added later, the keyboard shortcut were unavailable

awesomerc.lua.in

@@ -292,41 +292,39 @@ clientkeys = awful.util.table.join(
         end)
 )
 
--- Compute the maximum number of digit we need, limited to 9
-keynumber = 0
-for s = 1, screen.count() do
-   keynumber = math.min(9, math.max(#tags[s], keynumber))
-end
-
 -- Bind all key numbers to tags.
 -- Be careful: we use keycodes to make it works on any keyboard layout.
 -- This should map on the top row of your keyboard, usually 1 to 9.
-for i = 1, keynumber do
+for i = 1, 9 do
     globalkeys = awful.util.table.join(globalkeys,
         awful.key({ modkey }, "#" .. i + 9,
                   function ()
                         local screen = mouse.screen
-                        if tags[screen][i] then
+                        local tag = awful.tag.gettags(screen)[i]
-                            awful.tag.viewonly(tags[screen][i])
+                        if tag then
+                           awful.tag.viewonly(tag)
                         end
                   end),
         awful.key({ modkey, "Control" }, "#" .. i + 9,
                   function ()
                       local screen = mouse.screen
-                      if tags[screen][i] then
+                      local tag = awful.tag.gettags(screen)[i]
-                          awful.tag.viewtoggle(tags[screen][i])
+                      if tag then
+                         awful.tag.viewtoggle(tag)
                       end
                   end),
         awful.key({ modkey, "Shift" }, "#" .. i + 9,
                   function ()
-                      if client.focus and tags[client.focus.screen][i] then
+                      local tag = awful.tag.gettags(client.focus.screen)[i]
-                          awful.client.movetotag(tags[client.focus.screen][i])
+                      if client.focus and tag then
-                      end
+                          awful.client.movetotag(tag)
+                     end
                   end),
         awful.key({ modkey, "Control", "Shift" }, "#" .. i + 9,
                   function ()
-                      if client.focus and tags[client.focus.screen][i] then
+                      local tag = awful.tag.gettags(client.focus.screen)[i]
-                          awful.client.toggletag(tags[client.focus.screen][i])
+                      if client.focus and tag then
+                          awful.client.toggletag(tag)
                       end
                   end))
 end