Dumper: Fix dumping of nameless symbols

... like blocks

Change-Id: Ide53fd3758b09d996e4b7d7ebe91d50a8252cd27
Reviewed-by: hjk <hjk@theqtcompany.com>

share/qtcreator/debugger/creatortypes.py

@@ -31,7 +31,10 @@
 from dumper import *
 
 def dumpLiteral(d, value):
-    d.putSimpleCharArray(value["_chars"], value["_size"])
+    if d.isNull(value):
+        d.putValue("<null>")
+    else:
+        d.putSimpleCharArray(value["_chars"], value["_size"])
 
 def qdump__Core__Id(d, value):
     try: