[PATCH 0 of 2 default] record: checks -u option in cmd before aborting

[Sandeep.C.R]

record: check if a username is passed via -u option before aborting

record operation now aborts if it cannot find a user name or email from
environment or any of the hgrc files, even when a username is passed explictly
using the -u command line option. This patchs checks the command line arguments
for a username in addition to the sources checked in ui.username() function.