Only do initial login if credentials are available

src/main/java/ctbrec/sites/camsoda/Camsoda.java

@@ -94,8 +94,10 @@ public class Camsoda extends AbstractSite {
 
     @Override
     public void login() throws IOException {
+        if(credentialsAvailable()) {
             getHttpClient().login();
         }
+    }
 
     @Override
     public HttpClient getHttpClient() {