When adding file upload fields to existing model, if no file is supplied, the entire Model portion of the array is unset

[sdoney]

so if i have a model Books and i want have an image for each book, without usign a sepreate table to store the book images

Array
(
    [Book] => Array
        (
            [id] => 348
            [name] => Some Book Name
            [file] => Array
                (
                    [name] => 
                    [type] => 
                    [tmp_name] => 
                    [error] => 4
                    [size] => 0
                )
        )
)

if no file has been uploaded (either because none was chosen or one already exists) then it unsets the entire model rather than just the [file] portion

this patch introduces a allowEmpty option which defaults to false, but if true will only unset the [file] portion allowing any changes to the [name] to be saved

diff --git a/config/file_upload_settings.php b/config/file_upload_settings.php
old mode 100644
new mode 100755
index 2b08d42..ea2cc8f
--- a/config/file_upload_settings.php
+++ b/config/file_upload_settings.php
@@ -187,7 +187,14 @@ class FileUploadSettings {
       \*  'fileNameFunction' => 'md5'
       \*  'fileNameFunction' => 'crc32'
       */
-    'fileNameFunction' => false
-    'fileNameFunction' => false,
  +
-        /**
-         \* To allow Model to be saved without the file fields if no file is uploaded.
-         *
-         \* For use when using FileUpload directly on an existing Model.
-         */
- ```
    'allowEmpty' => false
  ```
  
  );
  
  }
  diff --git a/models/behaviors/file_upload.php b/models/behaviors/file_upload.php
  old mode 100644
  new mode 100755
  index 040b5d1..21c6418
  --- a/models/behaviors/file_upload.php
  +++ b/models/behaviors/file_upload.php
  @@ -76,7 +76,12 @@ class FileUploadBehavior extends ModelBehavior {
       unset($Model->data[$Model->alias][$this->options[$Model->alias]['fileVar']]);
     }
     else {
-        unset($Model->data[$Model->alias]);
-                 if ($this->options[$Model->alias]['allowEmpty']) {
-                         //unset only the file portion of the model so that the rest fo the model's data will be saved
-                         unset($Model->data[$Model->alias]['file']);
-                 } else {
-                         unset($Model->data[$Model->alias]);
-                 }
     }
   }
   return $Model->beforeSave();