rm: unexpected confirmation prompt (briandfoy#957)

* When attempting to remove a file that doesn't exist, rm shows a prompt about the file being read-only
* If I then confirm by typing "y", I see the unlink() error which explains the file wasn't found
* Bypass the prompt by adding an -e file check; the "-w FILE" is false if FILE doesn't exist

Author: mknos

bin/rm

@@ -259,7 +259,7 @@ sub remove_file {
 		$self->message( "$filename: ? " );
 		return OP_SUCCEEDED if <STDIN> =~ /^[Nn]/;
     }
-    elsif( !$self->is_force && ! -w $filename ) {
+    elsif( !$self->is_force && -e $filename && ! -w $filename ) {
 		$self->message( "$filename: Read-only ? " );
 		return OP_SUCCEEDED if <STDIN> =~ /^[Nn]/;
     }