[web2py] Bug: Query with Expression that contains space within

[Ignacio Ocampo]

When I use custom expression, that contains comma within, it fails if I use 
an space after comma.

*Example 1*
--- WORKS ---
query = ac(tickets.id>0).select(tickets.name, tickets.created_on, 
"DATEDIFF(tickets.created_*on,N*OW())")
colnames=['tickets.name', 'tickets.created_on', 'DATEDIFF(tickets.created_o*
n,N*OW())']

--- DON'T WORKS ---
query = ac(tickets.id>0).select(tickets.name, tickets.created_on, 
"DATEDIFF(tickets.created_*on, N*OW())")
colnames=['tickets.name', 'tickets.created_on', 'DATEDIFF(tickets.created_on
*', '*NOW())']

*Example 2*
--- WORKS ---
query = ac(tickets.id>0).select(tickets.name, tickets.created_on, 
"SUBSTRING(tickets.nam*e,5*)")
colnames=['tickets.name', 'tickets.created_on', 'SUBSTRING(tickets.nam*e,5*
)']
--- DON'T WORKS ---
query = ac(tickets.id>0).select(tickets.name, tickets.created_on, 
"SUBSTRING(tickets.nam*e, 5*)")
colnames=['tickets.name', 'tickets.created_on', 'SUBSTRING(tickets.name*', '
*5)']

--