fix wrong Row number in DiscoveryDialog.py that caused following traceback:

Traceback (most recent call last):
File "/home/beremiz/beremiz/ProjectController.py", line 1536, in _Connect
dialog = DiscoveryDialog(self.AppFrame)
File "/home/beremiz/beremiz/dialogs/DiscoveryDialog.py", line 124, in __init__
self._init_ctrls(parent)
File "/home/beremiz/beremiz/dialogs/DiscoveryDialog.py", line 121, in _init_ctrls
self._init_sizers()
File "/home/beremiz/beremiz/dialogs/DiscoveryDialog.py", line 73, in _init_sizers
self._init_coll_ButtonGridSizer_Growables(self.ButtonGridSizer)
File "/home/beremiz/beremiz/dialogs/DiscoveryDialog.py", line 64, in _init_coll_ButtonGridSizer_Growables
parent.AddGrowableRow(1)
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/_core.py", line 15343, in AddGrowableRow
return _core_.FlexGridSizer_AddGrowableRow(*args, **kwargs)
PyAssertionError: C++ assertion "!m_rows || idx < (size_t)m_rows" failed at ../src/common/sizer.cpp(1967) in AddGrowableRow(): invalid row index

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import os 

import wx

# Get the default language
langid = wx.LANGUAGE_DEFAULT

# Define locale for wx
locale = wx.Locale(langid)

def GetDomain(path):
    for name in os.listdir(path):
        filepath = os.path.join(path, name)
        basename, fileext = os.path.splitext(name)
        if os.path.isdir(filepath):
            result = GetDomain(filepath)
            if result is not None:
                return result
        elif fileext == ".mo":
            return basename
    return None

def AddCatalog(locale_dir):
    if os.path.exists(locale_dir) and os.path.isdir(locale_dir):
        domain = GetDomain(locale_dir)
        if domain is not None:
            locale.AddCatalogLookupPathPrefix(locale_dir)
            locale.AddCatalog(domain)