Quickfix for empty request attributes

Author: Ben McLean

.gitignore

@@ -2,3 +2,4 @@
 .classpath
 .project
 target/
+src/au/com/origma/perspectiveapi/v1alpha1/Main.java

src/au/com/origma/perspectiveapi/v1alpha1/models/AnalyzeCommentRequest.java

@@ -130,7 +130,11 @@ public Builder requestedAttributes(Map<AttributeType, RequestedAttribute> reques
 		}
 
 		public Builder addRequestedAttribute(AttributeType type, RequestedAttribute requestedAttribute) {
-			requestedAttributes.put(type, requestedAttribute);
+			if(requestedAttribute != null){
+				requestedAttributes.put(type, requestedAttribute);
+			}else{
+				requestedAttributes.put(type, new RequestedAttribute());
+			}
 			return this;
 		}