Upgrade crash in upgrade_bootloader_gui.py

[Anduin Withers]

I'll submit a ticket when I can (currently bugzilla claims "The product name
'' is invalid or does not exist.").

If you are doing an upgrade and it fails because of an exception in 
upgrade_bootloader_gui.py line 78, delete/comment all the blank lines in
your /etc/modprobe.conf file.

The code looks like this:

for l in lines:
    if l.strip()[0] = '#':
    	continue
    blah

This fails miserably when a blank line is encountered.