Check if 'address' field exists before using it

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

main.py

@@ -301,6 +301,8 @@ class Bear():
             for index in range(0, entry['number_of_elements']):
                 kid = flat_entry.copy()
                 kid['name'] = '{name}[{index}]'.format(name=flat_entry['name'], index=index)
+
+                if ('address' in flat_entry) and ('size_byte' in entry):
                     kid['address'] = hex(int(flat_entry['address'], 16) + entry['size_byte'] * index)
 
                 self.pettanko(kid)