pydoctor for twisted no fetch

twisted.diff

diff --git twisted/python/_pydoctor.py twisted/python/_pydoctor.py
index 76a5458..4d064b4 100644
--- twisted/python/_pydoctor.py
+++ twisted/python/_pydoctor.py
@@ -60,6 +60,13 @@ class TwistedSphinxInventory(SphinxInventory):
             # as an exceptional case.
             # We get the base URL from IInterface which is assume that is
             # always and already well defined in the Sphinx index.
+            link = self._links.get('zope.interface.interfaces.IInterface')
+
+            if not link:
+                # Most probably that the zope.interface inventory was not
+                # loaded.
+                return None
+
             baseURL, _ = self._links.get(
                 'zope.interface.interfaces.IInterface')
 
diff --git twisted/python/_release.py twisted/python/_release.py
index 84ab8c0..9f27a76 100644
--- twisted/python/_release.py
+++ twisted/python/_release.py
@@ -529,7 +529,7 @@ class APIBuilder(object):
              "--html-viewsource-base", sourceURL,
              "--add-package", packagePath.path,
              "--html-output", outputPath.path,
-             "--html-write-function-pages", "--quiet", "--make-html",
+             "--html-write-function-pages", "--make-html",
             ] + intersphinxes)