Just checking that this is desired behavior.  I found it useful today.

sage: h(x)=2*sin(x^2)
sage: h()
2*sin(x^2)

In fact, the only other way I can find to access the 'output formula'
of a callable symbolic expression is this:

sage: SR(h)
2*sin(x^2)

If someone has a problem with the first one, I thought I'd bring it
up.  If it's not a big deal, though, it would be nice to document it.

- kcrisman

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