Problemas cuando no existen mensajes en la DB

[JWScr33d]

`/Whatsapp-Forensic-OPEN/parser_db.py", line 14, in analyze_db
for row in cursor.execute('SELECT * FROM messages where edit_version=7 and key_from_me = 1 ORDER BY _id'):
OperationalError: no such table: messages
Verify that the WhatsappDB directory is created
Exception in Tkinter callback
Traceback (most recent call last):
File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1540, in call
return self.func(*args)
File "Guasap_Forensic.py", line 289, in
button_dbc = Button(root, text="Extract Encrypt Data Base", width=61, state=NORMAL, command=lambda: whatsapp_deb(root, 4))
File "Guasap_Forensic.py", line 118, in whatsapp_deb
whatsapp_db_f(root)
File "Guasap_Forensic.py", line 217, in whatsapp_db_f
list_dbs=whatsapp_db.extract_db()
File "/home/d3m0n1/Escritorio/Whatsapp-Forensic-OPEN/whatsapp_db.py", line 13, in extract_db
for db in dbs:
TypeError: 'NoneType' object is not iterable

También sucede un error semejante al realizar la funcion de extraer la db cifrada:
/Whatsapp-Forensic-OPEN/whatsapp_db.py", line 13, in extract_db for db in dbs: TypeError: 'NoneType' object is not iterable