introduce NOATTR checker (not existing attribute)
fix 3 NOATTR FPs on a simple snippet ("misc58.py")
reduce number of NOATTR FP on gramps-3.3.0 to 8070
reduce number of NOATTR FP on gramps-3.3.0 to 8042
reduce number of NOATTR FP on gramps-3.3.0 to 7317
reduce number of NOATTR FP on gramps-3.3.0 to 6512