magnifier: fix then no tiled client

Signed-off-by: Julien Danjou <julien@danjou.info>

lib/awful/layout/suit/magnifier.lua.in

@@ -34,15 +34,15 @@ function arrange(p)
         fidx = 1
     end
 
-    -- Abort if no clients are present
-    if not focus then return end
-
     -- If focused window is not tiled, take the first one which is tiled.
     if client.floating.get(focus) then
         focus = cls[1]
         fidx = 1
     end
 
+    -- Abort if no clients are present
+    if not focus then return end
+
     local geometry = {}
     if #cls > 1 then
         geometry.width = area.width * math.sqrt(mwfact)