Fix crash on clear disabled iconview search line

This resolves Bug 1735
(cherry picked from commit b46a7c35c1)

kdeui/kiconviewsearchline.cpp

@@ -127,6 +127,9 @@ void KIconViewSearchLine::updateSearch( const TQString &s )
 
 void KIconViewSearchLine::clear()
 {
+	if( ! d->iconView )
+		return; // disabled
+
 	// Clear hidden list, give items back to TQIconView, if it still exists
 	TQIconViewItem *item = NULL;