Fix printing entry when address and symbol are bad

Signed-off-by: Juraj Oravec <jurajoravec@mailo.com>

main.py

@@ -265,7 +265,14 @@ class Bear():
 
     def pretty_print(self):
         for entry in self.flat_list:
-            print('{address}\t{variable_name}'.format(address=entry['address'],
+            address = ''
+            if 'address' in entry:
+                address=entry['address']
+
+            if not address and entry['name'] == '?':
+                continue
+
+            print('{address}\t{variable_name}'.format(address=address,
                                                       variable_name=entry['name']))
 
     def parse_location(self, die, attr):