Merge branch 'morosi-fix' into 'master'

Add missing check to call diff/show on constructs

See merge request it/e3-aws!86

Author: adanaja

src/e3/aws/troposphere/__init__.py

@@ -445,10 +445,11 @@ def _show(self, stack: cfn.Stack) -> None:
             # and so is not able to diff itself. This must be done via the PyFunction
             # construct
             for construct in stack.constructs:
-                if self.args.diff:
-                    construct.diff(stack=stack)
-                else:
-                    construct.show(stack=stack)
+                if isinstance(construct, Construct):
+                    if self.args.diff:
+                        construct.diff(stack=stack)
+                    else:
+                        construct.show(stack=stack)
 
         # Output the rest of the stack
         super()._show(stack=stack)