Do not attempt to update the auth state if not valid

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@627483 13f79535-47bb-0310-9956-ffa450edef68

module-client/src/main/java/org/apache/http/client/AuthState.java

@@ -70,6 +70,10 @@ public class AuthState {
         this.credentials = null;
     }
 
+    public boolean isValid() {
+        return this.authScheme != null;
+    }
+    
     /**
      * Assigns the given {@link AuthScheme authentication scheme}.
      * 

module-client/src/main/java/org/apache/http/impl/client/DefaultClientRequestDirector.java

@@ -985,6 +985,10 @@ public class DefaultClientRequestDirector
             final HttpHost host,
             final CredentialsProvider credsProvider) {
         
+        if (!authState.isValid()) {
+            return;
+        }
+        
         String hostname = host.getHostName();
         int port = host.getPort();
         if (port < 0) {