Fix NPE in HelloSignClient.

Author: Chris Paul

src/test/java/com/hellosign/sdk/GeneralTest.java

@@ -0,0 +1,14 @@
+package com.hellosign.sdk;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class GeneralTest {
+
+    @Test
+    public void test() throws Exception {
+        HelloSignClient client = new HelloSignClient("chris@hellosign.com", "michaeljfax");
+        assertTrue(client.isOnline());
+    }
+}