Don't try deleting a file/directory that does not exist

git-svn-id: https://svn.apache.org/repos/asf/mina/ftpserver/trunk@774503 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/core/src/main/java/org/apache/ftpserver/util/IoUtils.java b/core/src/main/java/org/apache/ftpserver/util/IoUtils.java
index 41bb07f..a8f12fa 100644
--- a/core/src/main/java/org/apache/ftpserver/util/IoUtils.java
+++ b/core/src/main/java/org/apache/ftpserver/util/IoUtils.java
@@ -243,9 +243,7 @@
     }
 
     public final static void delete(File file) throws IOException {
-        if (!file.exists()) {
-            return;
-        } else if (file.isDirectory()) {
+        if (file.isDirectory()) {
             deleteDir(file);
         } else {
             deleteFile(file);