zopefoundation / Zope / 8806350432

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Do not fail when request has no ensure_publishable method.

This may happen in tests.
In a Plone core development buildout with Zope master there are failures in `plone.dexterity`:

```
$ bin/test -s plone.dexterity -u
...
Error in test test_acquire_without_dav (plone.dexterity.tests.test_webdav.TestDAVTraversal.test_acquire_without_dav)
Traceback (most recent call last):
  File "/Users/maurits/.pyenv/versions/3.11.7/lib/python3.11/unittest/case.py", line 57, in testPartExecutor
    yield
  File "/Users/maurits/.pyenv/versions/3.11.7/lib/python3.11/unittest/case.py", line 623, in run
    self._callTestMethod(testMethod)
  File "/Users/maurits/.pyenv/versions/3.11.7/lib/python3.11/unittest/case.py", line 579, in _callTestMethod
    if method() is not None:
  File "/Users/maurits/shared-eggs/cp311/plone.dexterity-3.0.5-py3.11.egg/plone/dexterity/tests/test_webdav.py", line 1174, in test_acquire_without_dav
    r = traversal.publishTraverse(request, "item")
  File "/Users/maurits/shared-eggs/cp311/plone.dexterity-3.0.5-py3.11.egg/plone/dexterity/browser/traversal.py", line 40, in publishTraverse
    defaultTraversal = super().publishTraverse(request, name)
  File "/Users/maurits/community/plone-coredev/6.0/src/Zope/src/ZPublisher/BaseRequest.py", line 142, in publishTraverse
    self.request.ensure_publishable(subobject)
AttributeError: 'DAVTestRequest' object has no attribute 'ensure_publishable'

...

Error in test test_get_acquired (plone.dexterity.tests.test_webdav.TestDexterityPublishTraverse.test_get_acquired)
Traceback (most recent call last):
  File "/Users/maurits/.pyenv/versions/3.11.7/lib/python3.11/unittest/case.py", line 57, in testPartExecutor
    yield
  File "/Users/maurits/.pyenv/versions/3.11.7/lib/python3.11/unittest/case.py", line 623, in run
    self._callTestMethod(testMethod)
  File "/Users/maurits/.pyenv/versions/3.11.7/lib/python3.11/unittest/case.py", line 579, in _callTestMethod
    if method() is not None:
  File "/Users/mauri... (continued)

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