minor refactor

Author: jshum2479

imagetool/src/main/java/com/oracle/weblogic/imagetool/util/HttpUtil.java

@@ -124,9 +124,10 @@ public static HttpClient getOraClient(String userId, String password) {
         String proxyHost = System.getProperty("https.proxyHost");
         String proxyPort  = System.getProperty("https.proxyPort");
         HttpClient result;
-        CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
+        CredentialsProvider credentialsProvider = null;
 
         if (userId != null && password != null) {
+            credentialsProvider = new BasicCredentialsProvider();
             credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(
                 userId, password));
         }