fix(python): module import fails with: KeyError: '__all__' (#2757)

Always emit an `__all__` declaration even if the module does not export anything. Fixes #2750 --- By submitting this pull request, I confirm that my contribution is made under the terms of the [Apache 2.0 license]. [Apache 2.0 license]: https://www.apache.org/licenses/LICENSE-2.0
aws · Mar 30, 2021 · c32a889 · c32a889
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diff --git a/packages/jsii-pacmak/lib/targets/python.ts b/packages/jsii-pacmak/lib/targets/python.ts
@@ -1597,6 +1597,8 @@ class PythonModule implements PythonType {
         code.line(`${member},`);
       }
       code.unindent(']');
+    } else {
+      code.line('__all__: List[typing.Any] = []');
     }
 
     // Finally, we'll use publication to ensure that all of the non-public names

diff --git a/packages/jsii-pacmak/test/generated-code/__snapshots__/target-python.test.ts.snap b/packages/jsii-pacmak/test/generated-code/__snapshots__/target-python.test.ts.snap