Fix content metadata

Author: aaustin

src/android/io/branch/BranchSDK.java

@@ -373,8 +373,10 @@ private void createBranchUniversalObject(JSONObject options) throws JSONExceptio
             Iterator<?> keys = contentMetaData.keys();
 
             while (keys.hasNext()) {
-                String key = (String) keys.next();
                 Log.d(LCAT, contentMetaData.getString(key));
+                String key = (String) keys.next();
+                String value = contentMetaData.optString(key);
+                this.branchObj.addContentMetadata(key, value);
             }
         }