fetch.php file not existing and devision by zero

If the cache file does not exist after it should have been generated via an action
plugin or via resizing filemtime fails with a file not found. This has to be fixed
by @filemtime.

Another fix is the check for the $INFO before resizing an image in get_resized.
get_croped has already been fixed

darcs-hash:20080805132309-f4337-41698af01cf1f3632bd68e1e10724bdffc7c58a3.gz

lib/exe/fetch.php

@@ -100,7 +100,7 @@
  */
 function sendFile($file,$mime,$cache){
   global $conf;
-  $fmtime = filemtime($file);
+  $fmtime = @filemtime($file);
   // send headers
   header("Content-Type: $mime");
   // smart http caching headers
@@ -212,7 +212,9 @@ function http_rangeRequest($size){
 function get_resized($file, $ext, $w, $h=0){
   global $conf;
 
-  $info  = getimagesize($file);
+  $info = @getimagesize($file); //get original size
+  if($info == false) return $file; // that's no image - it's a spaceship!
+
   if(!$h) $h = round(($w * $info[1]) / $info[0]);
 
   // we wont scale up to infinity