[issue18441] Idle: Make test.support.requires('gui') skip when it should.

[Roundup Robot]

Roundup Robot added the comment:

New changeset 9f922270a929 by Terry Jan Reedy in branch '2.7':
Issue #18441: fix buildbot name-error for TclError.
http://hg.python.org/cpython/rev/9f922270a929

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