[TYPO3-core] FYI72: Fix bug #133457: Failing query in db Check -> full search if a table has no usable colums

[Christian Kuhn]

The following patch will be committed do SVN trunk and 4.3 if nobody 
objects:

Type: bugfix

BT: http://bugs.typo3.org/view.php?id=13457

Branches: trunk, 4.3

Problem:
If a table has no usable columns, fullsearch creates invalid SQL:
SELECT COUNT(*) FROM tx_rsaauth_keys WHERE (tx_rsaauth_keys. LIKE 
'%testme%')

Solution:
Query a table only if at least one columns has been defined in TCA.

How to reproduce:
- Install rsa auth extension
- Use the fulltext seach in db Check module
- Watch a failing query

Notes:
This patch fixes some minor XHTML issues in touched lines, too.

Regards
Christian
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