Write error trait to schema

This removes the error trait from the filter that filters out what
traits are written into the schema. This trait is needed when
serializing exceptions, as there is no access to the actual value
when the structure is being created.

Author: JordonPhillips

codegen/smithy-python-codegen/src/main/java/software/amazon/smithy/python/codegen/SchemaGenerator.java

@@ -21,7 +21,6 @@
 import software.amazon.smithy.model.shapes.ShapeId;
 import software.amazon.smithy.model.traits.DocumentationTrait;
 import software.amazon.smithy.model.traits.EnumTrait;
-import software.amazon.smithy.model.traits.ErrorTrait;
 import software.amazon.smithy.model.traits.UnitTypeTrait;
 import software.amazon.smithy.model.traits.synthetic.SyntheticEnumTrait;
 import software.amazon.smithy.utils.CaseUtils;
@@ -36,9 +35,10 @@
 final class SchemaGenerator implements Consumer<Shape> {
     private static final Logger LOGGER = Logger.getLogger(SchemaGenerator.class.getName());
 
-    // Filter out traits that already exist as generated parts of the class, such as documentation.
+    // Filter out traits that would overly bloat the definition, which are already part of the
+    // class, such as documentation.
     private static final Set<ShapeId> DEFAULT_TRAIT_FILTER = Set.of(
-            DocumentationTrait.ID, ErrorTrait.ID, EnumTrait.ID, SyntheticEnumTrait.ID
+            DocumentationTrait.ID, EnumTrait.ID, SyntheticEnumTrait.ID
     );
 
     private static final Symbol UNIT_SYMBOL = Symbol.builder()