Summary
	* Issue title: Property not found exo:folksonomy make the parent folder empty
	* CCP Issue:  CCP-1518 
	* Product Jira Issue: JCR-1952.
	* Complexity: Low

Proposal
 
Problem description

What is the problem to fix?
	* Property not found exo:folksonomy make the parent folder empty 

Fix description

Problem analysis
	* There was a bug in retrieving empty multi-valued property. Instead of returning empty string, PathNothFoundException was thrown.

How is the problem fixed?
	* Return empty string if multi-valued property has no values

Tests to perform

Reproduction test

    In web interface:
    	#. Create a new content folder
    	#. Import this file
    	#. Go to the imported folder : document is present
    	#. Add some other documents
    Via webdav on windows 7:
    	#. Map a network drive to the repository collaboration
    	#. Go to this folder NoFolksonomy.

-> It seems empty and the exception is raised.

Tests performed at DevLevel
	* Functional testing

Tests performed at Support Level
	* N/A

Tests performed at QA
	*

Changes in Test Referential

Changes in SNIFF/FUNC/REG tests
	* No

Changes in Selenium scripts 
	* No

Documentation changes

Documentation (User/Admin/Dev/Ref) changes:
	* No

Configuration changes

Configuration changes:
	* No

Will previous configuration continue to work?
	* Yes

Risks and impacts

Can this bug fix have any side effects on current client projects?
	* Any change in API (name, signature, annotation of a class/method)? 
	* Data (template, node type) migration/upgrade:  No

Is there a performance risk/cost?
	* No

Validation (PM/Support/QA)

PM Comment
	* Validated

Support Comment
	* Validated

QA Feedbacks
	*
