embed() fails if config files not installed

[takluyver]

From Matthew Brett on the mailing list:

I tried:

from IPython import embed
embed()

and got:

Traceback (most recent call last):
...
IOError: File u'ipython_config.py' does not exist in any of the search
paths: (u'/Users/mb312/.ipython/profile_default',)

I was surprised that I could start ipython without this error, but the
embed() shell raised it. Obviously:

ipython profile create

solved that one, but maybe it would be worth documenting.