CDBViewQuantity shouldn't crash in the editor.

--HG--
branch : dfighter-tools

code/nel/src/gui/dbview_quantity.cpp

@@ -156,6 +156,8 @@ namespace NLGUI
 
 	// ***************************************************************************
 	void CDBViewQuantity::draw ()
+	{
+		if( _Number.hasValue() && _NumberMax.hasValue() )
 		{
 			// change text
 			sint32	val= _Number.getSInt32();
@@ -166,6 +168,7 @@ namespace NLGUI
 				_CacheMax=valMax;
 				buildTextFromCache();
 			}
+		}
 
 		// parent call
 		CViewText::draw();