debugger: Fix address output for watchers

There is no address for on-the-fly expressions

Change-Id: Id8c1c2e4d727732196386928a9eddc7c81073415
Reviewed-on: http://codereview.qt.nokia.com/73
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: hjk

share/qtcreator/gdbmacros/dumper.py

@@ -1472,7 +1472,11 @@ class Dumper:
 
     def putAddress(self, addr):
         if self.printsAddress:
-            self.put('addr="0x%x",' % long(addr))
+            try:
+                # addr can be "None", long(None) fails.
+                self.put('addr="0x%x",' % long(addr))
+            except:
+                pass
 
     def putNumChild(self, numchild):
         #warn("NUM CHILD: '%s' '%s'" % (numchild, self.currentChildNumChild))