Fix lint warnings

1 files changed, 5 insertions, 3 deletions

diff --git a/astroid/helpers.py b/astroid/helpers.py
index 62da56ea..52647d88 100644
--- a/astroid/helpers.py
+++ b/astroid/helpers.py
@@ -99,14 +99,15 @@ def safe_infer(node, context=None):
         inferit = node.infer(context=context)
         value = next(inferit)
     except exceptions.InferenceError:
-        return
+        return None
     try:
         next(inferit)
-        return # None if there is ambiguity on the inferred node
+        return None # None if there is ambiguity on the inferred node
     except exceptions.InferenceError:
-        return # there is some kind of ambiguity
+        return None# there is some kind of ambiguity
     except StopIteration:
         return value
+    return None
 
 
 def has_known_bases(klass, context=None):
@@ -171,3 +172,4 @@ def class_instance_as_index(node):
                     return result
     except exceptions.InferenceError:
         pass
+    return None