Fix regression

Injecting into methods of false-ish objects would fail

injector.py

@@ -618,12 +618,15 @@ def call_with_injection(self, callable, self_, args=(), kwargs={}):
         dependencies = self.args_to_inject(
             function=callable,
             bindings=needed,
-            owner_key=self_.__class__ if self_ else callable.__module__)
+            owner_key=self_.__class__ if self_ is not None
+                else callable.__module__)
 
         dependencies.update(kwargs)
 
         try:
-            return callable(*((self_,) if self_ else ()) + tuple(args), **dependencies)
+            return callable(
+                *((self_,) if self_ is not None else ()) + tuple(args),
+                **dependencies)
         except TypeError as e:
             reraise(e, CallError(self_, callable, args, dependencies, e))
 

injector_test.py

@@ -982,3 +982,15 @@ def singleton_provides():
 
     assert provides_singleton.__binding__.scope == SingletonScope
     assert singleton_provides.__binding__.scope == SingletonScope
+
+
+def test_injecting_into_method_of_object_that_is_falseish_works():
+    # regression test
+
+    class X(dict):
+        @inject(s=str)
+        def __init__(self, s):
+            pass
+
+    injector = Injector()
+    injector.get(X)