Fix crash when accessing a query with duplicated table names

Review Request #118519 - Created June 4, 2014 and submitted - Latest diff uploaded

Information
Jarosław Staniek
calligra
calligra/2.8
315852
Reviewers
calligra
andriusr, okukharchuk, piggz, tanis, tolszak, wicik, wkosowicz
Fix crash when accessing a query with duplicated table names

Example query that crashed: SELECT t.foo FROM t, t.
Now error message is displayed so user can fix the statement.

FIXED-IN:2.8.4
No longer crashes for tested queries, we're no longer using dangerous function at() in this context
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