[TYPO3-core] RFC: Fix bug #1391: Typo3 can't display a single "0" in a table cell

[Michael Stucki]

This is a CVS patch request. I've sent this patch some months ago but never 
finished it. So here is a new patch.

Problem:
In a text element containing a table a single "0" in a cell isn't rendered 
properly in the FE outbut but a "1" (for example) does:
 
 <td>0<td> becomes to <td>&nbsp;</td> but
 <td>0&nbsp;</td> stays <td>0&nbsp;</td> and
 <td>1</td> stays <td>1</td>


Solution:
Introduce new stdWrap property "ifBlank" and modify the table rendering TS 
accordingly.

Background information:
The "ifEmpty" stdWrap is unfortunately not doing what it claims to be: It 
doesn't check if a string is empty, instead it just tests if the value is 
true or not. (Therefore the TSref contains a notice that "Zero's are an empty 
value!")

The solution is to add a new property which compares the value using 
strcmp('',$value).


Documentation:
ifBlank
string / stdWrap
Same as "ifEmpty" but the check is done using a binary comparison (strcmp).

- michael
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