Merge pull request #205 from CodeAtlas/apigateway_ignore_null_parameters

Ignore null request parameters

Author: karthiksaligrama

aws-android-sdk-apigateway-core/src/main/java/com/amazonaws/mobileconnectors/apigateway/ApiClientHandler.java

@@ -197,6 +197,10 @@ Request<?> buildRequest(Method method, Object[] args) {
     void processParameter(Request<?> request, Parameter p, Object arg) {
         final String name = p.name();
         final String location = p.location();
+        
+        if (arg == null) {
+        	return;
+        }
 
         if ("header".equals(location)) {
             request.addHeader(name, String.valueOf(arg));