Call inspectutils.GetClassAttrsDict on component, not None (#606)

* inspectutils.GetClassAttrsDict on component, not None
* Remove ubuntu-20.04 in favor of ubuntu-22.04 for Python 3.7

Author: dbieber

.github/workflows/build.yml

@@ -18,7 +18,7 @@ jobs:
         os: ["macos-latest", "ubuntu-latest"]
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13.0-rc.2"]
         include:
-          - {os: "ubuntu-20.04", python-version: "3.7"}
+          - {os: "ubuntu-22.04", python-version: "3.7"}
 
     steps:
      # Checkout the repo.

fire/completion.py

@@ -321,7 +321,7 @@ def MemberVisible(component, name, member, class_attrs=None, verbose=False):
   if inspect.isclass(component):
     # If class_attrs has not been provided, compute it.
     if class_attrs is None:
-      class_attrs = inspectutils.GetClassAttrsDict(class_attrs) or {}
+      class_attrs = inspectutils.GetClassAttrsDict(component) or {}
     class_attr = class_attrs.get(name)
     if class_attr:
       # Methods and properties should only be accessible on instantiated