[TYPO3-core] RFC: #12299: EM tries to read from tables of not installed extensions

[Martin Holtz]

Hi

> Solution:
> don't do this if extension isn't installed
i dont think, that is the best solution.

There could be a table which should be possible to dump - without installing 
that extension.

So i changed the code a little bit, to check first if the table is in the 
database.

But the else-clause should be changed then too - is there a standard error 
message like "sorry, sql error occured"?

So i could change
 $GLOBALS['LANG']->getLL('extBackup_table_not_there')
in the else-clause.

thanks for reading,
martin
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