Add messages when things go wrong

Author: NathanJPhillips

scripts/pretty-printers/gdb/pretty_printers.py

@@ -42,8 +42,10 @@ def to_string(self):
             if value.is_optimized_out:
                 return "{}: <Optimized out>".format(string_no)
             return "{}: \"{}\"".format(string_no, value.string().replace("\0", "").replace("\"", "\\\""))
+        except RuntimeError as e:
+            return "Exception evaluating dstringt: {}".format(e.message)
         except:
-            return ""
+            return "Exception evaluating dstringt"
 
     def display_hint(self):
         return None