bundlerepo: avoid exception in __del__ when the bundle doesn't exist

$ hg -R bundle://foo.hg
abort: No such file or directory: foo.hg
Exception exceptions.AttributeError: "'bundlerepository' object has no attribute 'bundlefile'" in <bound method bundlerepository.__del__ of <mercurial.bundlerepo.bundlerepository object at 0xa7ab9fac>> ignored

mercurial/bundlerepo.py

@@ -233,10 +233,12 b' class bundlerepository(localrepo.localre'
         self.bundlefile.close()
 
     def __del__(self):
-        if not self.bundlefile.closed:
-            self.bundlefile.close()
-        if self.tempfile is not None:
-            os.unlink(self.tempfile)
+        bundlefile = getattr(self, 'bundlefile', None)
+        if bundlefile and not bundlefile.closed:
+            bundlefile.close()
+        tempfile = getattr(self, 'tempfile', None)
+        if tempfile is not None:
+            os.unlink(tempfile)
 
 def instance(ui, path, create):
     if create:

tests/test-bundle

@@ -57,4 +57,5 b' cd partial'
 hg -R bundle://../full.hg log
 hg incoming bundle://../full.hg
 hg -R bundle://../full.hg outgoing ../partial2
+hg -R bundle://../does-not-exist.hg outgoing ../partial2
 cd ..

tests/test-bundle.out

@@ -208,3 +208,4 b' user: test'
 date:        Mon Jan 12 13:46:40 1970 +0000
 summary:     0.3m
 
+abort: No such file or directory: ../does-not-exist.hg