code: drawterm

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osx-cocoa: ensure array is non-empty before indexing

If we have nothing pastable, we can get either a nil or
an empty array. We were checking for nil, but we'd index
the empty array and crash. Now we don't.

--- a/gui-cocoa/screen.m

+++ b/gui-cocoa/screen.m

@@ -74,7 +74,7 @@

 	NSArray *classes = [NSArray arrayWithObjects:[NSString class], nil];

 	NSDictionary *options = [NSDictionary dictionary];

 	NSArray *it = [pb readObjectsForClasses:classes options:options];

-	if(it != nil)

+	if(it != nil && [it count] > 0)

 		return strdup([it[0] UTF8String]);

 	return nil;

 }