Fix for GrepViewWidget

[Mario Scalas]

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Problem: when one rmb click on the GrepView widget && it is empty than gideon 
crash.
Solution: check for pointer != null before using it ;) 

Mario :)

- -- 
Mario Scalas <mario dot scalas at libero dot it>
Miser miser! Modo niger et ustus fortiter.
homepage: http://digilander.iol.it/zakuteam
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