#692 Mexico exchange - Can\'t update quotes

[m_legrand]

File "c:\itrade\itrade_wxlistquote.py", line 770, in OnDownload
fn(quotes,self.m_market,dlg,x)
File "c:\itrade\ext\itrade_quotes_mexico.py", line 177, in Import_ListOfQuotes_MEX
dataline = data[a:data.index(endch,a)]
ValueError: substring not found