Add "block_no_data" parameter for m_IfDataExists tag

Imported From: http://groups.google.com/group/in-portal-dev/browse_thread/thread/8daad408a141c040#

I propose to add "block_no_data" parameter for m_IfDataExists tag. Will work the same as for m_RenderElement, so this two will work the same, but less code will be required:

COMMON PART:

<inp2:m_DefineElement name="sample_element"> 
    <inp2:Field name="Name"/> 
</inp2:m_DefineElement> 

<inp2:m_DefineElement name="no_data"> 
    no data 
</inp2:m_DefineElement>

OLD CASE:

<inp2:m_RenderElement name="sample_content" data_exists="1" block_no_data="no_data"/>

NEW CASE:

<inp2:m_IfDataExists block_no_data="no_data"> 
    <inp2:Field name="Name"/> 
</inp2:m_IfDataExists>

At the end we have no need to create temporary block to use for data presence check.

Add "block_no_data" parameter for m_IfDataExists tag

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