[633/906] display: fail properly in context creation in order to minimize a race...

[633/906] display: fail properly in context creation in order to minimize a race condition

previously, on context creation, when we failed to get a valid context
we would still atempt to run the window mainloop as well as setting an error
on the display. This would cause the calling element to finalize the display
and therefore attempt to quit the window mainloop.  However the mainloop
may not have started running.  Thus when the window mainloop ran it would
never a get a quit message and never end.