Trim values in parsed xml only if result is empty (#296)

Author: trivikr

smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/protocol-test-xml-stub.ts

@@ -16,7 +16,8 @@ const compareEquivalentXmlBodies = (expectedBody: string, generatedBody: string)
     attributeNamePrefix: '',
     ignoreAttributes: false,
     parseNodeValue: false,
-    tagValueProcessor: (val: any, tagName: any) => decodeEscapedXml(val)
+    trimValues: false,
+    tagValueProcessor: (val: any, tagName: any) => val.trim() === "" ? "" : decodeEscapedXml(val)
   };
 
   const parseXmlBody = (body: string) => {