fix schema generation for transformer corner case

When a Transformer affects an array element type, SchemaRepository
treated it as the non-transformed type. If the Transformer transformed
to a primitive, SchemaRepository tried to add the primitive as an object
schema, resulting in an error. This fixes that by getting the schema
type when dealing with array types.

endpoints-framework/src/main/java/com/google/api/server/spi/config/model/SchemaRepository.java

@@ -211,8 +211,11 @@ private void fillInFieldInformation(Field.Builder builder, TypeToken<?> fieldTyp
       builder.setSchemaReference(SchemaReference.create(this, config, fieldType));
     } else if (ft == FieldType.ARRAY) {
       Field.Builder arrayItemBuilder = Field.builder().setName(ARRAY_UNUSED_MSG);
-      fillInFieldInformation(arrayItemBuilder, Types.getArrayItemType(fieldType),
-          typesForConfig, config);
+      fillInFieldInformation(
+          arrayItemBuilder,
+          ApiAnnotationIntrospector.getSchemaType(Types.getArrayItemType(fieldType), config),
+          typesForConfig,
+          config);
       builder.setArrayItemSchema(arrayItemBuilder.build());
     }
   }

endpoints-framework/src/test/java/com/google/api/server/spi/discovery/DiscoveryGeneratorTest.java

@@ -183,7 +183,6 @@ public void testDirectoryIsCloneable() throws Exception {
 
   private RestDescription getDiscovery(DiscoveryContext context, Class<?> serviceClass)
       throws Exception {
-    ImmutableList.Builder<ApiConfig> builder = ImmutableList.builder();
     ApiConfig config = configLoader.loadConfiguration(ServiceContext.create(), serviceClass);
     // If the clone call fails, the generated discovery is invalid.
     return Iterables.getFirst(