Sorry for that, I've been a bit careless.
I've looked at your commit on github:

tableRows = cursor.fetchone()[0]
+        if tableRows is None:
+            tableRows = 0

If you do that you'll still have a

 TypeError: 'NoneType' object has no attribute '__getitem__' 

because it's cursor.fetchone() which return None, I suggest this if you don't mind.

tableRows = cursor.fetchone()
tableRows = tableRows[0] if tableRows is not None else 0

This sounds somehow strange to me. Since SQL is max, it shall return at least one row, and fetchone() shall return that value. If no, there could be another error such as connection or table definition.

MAX() will return NULL on empty tables. I think a standard fix is to use COALESCE(MAX(...), 0), where COALESCE returns the first non-NULL value in its arguments.

If we want to go SQL, I want to point we would better to use NULLIF...

Yes, in fact I was wrong.
COALESCE seems fine, I've just tested it.

cursor.execute("select COALESCE(MAX(%s),0) from %s" % (idLab, tableName))
tableRows = cursor.fetchone()
tableRows = tableRows[0] if tableRows is not None else 0

Should we merge and close that issue ?

I posted a wrong comment sorry. NULLIF is the opposite operation.

For fix, if we put null validation code in SQL, I'd rather propose to arise exception (but not by print) than handling None for fetchone(), since the error shall be invoked or injected well before the SQL just executed. So, I'd propose

cursor.execute("select COALESCE(MAX(%s),0) from %s" % (idLab, tableName))
tableRows = cursor.fetchone()
if tableRows is None:
    raise ValueError('Could not get MAX(%s) from %s' % (idLab, tableName))
else:
    tableRows = tableRows[0]

or similar.

merged.