TYPO3.Flow

Imagine a select-box like this:

<label for="categories">Categories:</label> 
<select name="content[categories][]" multiple="TRUE" id="categories">
  <option value="0">Category 1</option>
  <option value="1">Category 2</option>
  <option value="2">Category 3</option>
</select>

with this array-property:

/**
 * @var array 
 */ 
protected $categories;

The select box allows multiple selected categories and none is selected by default.

If you submit the form without selecting any category, the PropertyMapper throws the exception:

No converter found which can be used to convert from" "string" to "array".

The property mapper treats the empty values of the categories-select as string.
Shouldn't in this case the ArrayConverter accept empty strings and convert them to an empty array()?