[PATCH] use pycurl only when engine initializable

[Alexander Belchenko]

On my windows machine pycurl usable only when I'm have actual Internet
connection. When I'm offline any attempt to use pycurl raise error:

  >>> import pycurl
  >>> pycurl.Curl()
Traceback (most recent call last):
    File "<stdin>", line 1, in ?
pycurl.error: initializing curl failed

As result there is a bunch of unrelated errors during selftest.

Attached patch ensure that pycurl is usable. Othwerwise it raise
exception. And all PyCurl test will be skipped.

--
Alexander

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