Remove another "no cover"

nilmdb/utils/serializer.py

@@ -118,7 +118,7 @@ def serializer_proxy(obj_or_type):
             try:
                 # Signal thread to exit, but don't wait for it.
                 self.__call_queue.put((None, None, None, None))
-            except: # pragma: no cover
+            except:
                 pass
 
     return SerializerObjectProxy(obj_or_type)

tests/test_serializer.py

@@ -112,3 +112,11 @@ class TestSerializer(Base):
         i = sp(ListLike)()
         eq_(list(i), [1,2,3,4,5])
         eq_(i[3], 3)
+
+    def test_del(self):
+        sp = nilmdb.utils.serializer_proxy
+        foo = sp(Foo("x"))
+
+        # trigger exception in __del__, which should be ignored
+        foo._SerializerObjectProxy__call_queue = None
+        del foo