There is no check of existance generator and exception when privileges are 
granted
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                 Key: CORE-5852
                 URL: http://tracker.firebirdsql.org/browse/CORE-5852
             Project: Firebird Core
          Issue Type: Bug
          Components: Engine
    Affects Versions: 3.0.3, 4.0 Alpha 1
            Reporter: Roman Simakov


RDB$TRIGGER9 checks that object exists. After adding USAGE privilege on 
generator and exception related checks were not added to RDB$TRIGGER9. As 
result we can grant privilege to non existing object. In the same time it's 
reaaly hard to maintain system triggers in clean BLR code and after protecting 
system tables from modifications we may move such checks to engine.

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