Fix #6936: sphinx-autogen: raises AttributeError

Author: tk0miya

CHANGES

@@ -16,6 +16,8 @@ Features added
 Bugs fixed
 ----------
 
+* #6936: sphinx-autogen: raises AttributeError
+
 Testing
 --------
 

sphinx/ext/autosummary/generate.py

@@ -59,6 +59,11 @@ def __init__(self) -> None:
         self.registry = SphinxComponentRegistry()
         self.messagelog = []  # type: List[str]
         self.verbosity = 0
+        self._warncount = 0
+        self.warningiserror = False
+
+    def emit_firstresult(self, *args) -> None:
+        pass
 
 
 def setup_documenters(app: Any) -> None: