NSTextField setStringValue nil value

[Riccardo Mottola]

Hi,

while porting an application from GNUstep to Cocoa, I noticed that while 
Cocoa rises an exception if you send nil with setStringValue to a 
textfield, GNUstep silently accepts it.

I think we should match Apple's behaviour which appears to be this since 
a long time [1] (note the commentof setStringValue vs. setObjectValue)

I couldn't find an explicit reference of this in NSCOntrol's 
documentation though.

Riccardo



[1] 
http://www.cocoabuilder.com/archive/cocoa/343-clearing-nstextfield.html#338