Bugfix, trying to delete non-existing file.

I wanted to drop a release on the world, but luckily
Li Xing sent me a comment on my new removal implementation.

Any other bugs will have to be resolved in 0.1.5.. I'm ready
to release 0.1.4 and see what happens next.

autotrash

@@ -81,8 +81,12 @@ def purge(trash_directory, trash_name, dryrun):
         logging.log(VERBOSE, 'Removing directory %s', target)
         shutil.rmtree(target, False, on_remove_error)
     else:
-        logging.log(VERBOSE, 'Removing file %s', target)
-        os.unlink(target)
+        #Make sure we do not try to unlink a file that does not exist.
+        if os.path.exists(target):
+            logging.log(VERBOSE, 'Removing file %s', target)
+            os.unlink(target)
+        else:
+            logging.log(VERBOSE, 'Ignore non-existing file %s', target)
 
     os.unlink(trash_name)
     return True