Fix remaining SpotBugs UWF_FIELD_NOT_INITIALIZED_IN_CONSTRUCTOR violations.

Addressed missed null checks in:
- RequestBuilder.java: Added null checks for response and list.
- DateSpinner.java: Added null check for day field.

This builds upon previous fixes to enforce the rule in CI.

Author: google-labs-jules[bot]

CodenameOne/src/com/codename1/io/rest/RequestBuilder.java

@@ -837,7 +837,13 @@ public Response<List<PropertyBusinessObject>> getAsPropertyList(Class type, Stri
         CN.addToQueueAndWait(request);
         Map response = ((Connection) request).json;
         try {
+            if (response == null) {
+                return null;
+            }
             List<Map> lst = (List<Map>) response.get(root);
+            if (lst == null) {
+                return null;
+            }
             List<PropertyBusinessObject> result = new ArrayList<PropertyBusinessObject>();
             for (Map m : lst) {
                 PropertyBusinessObject pb = (PropertyBusinessObject) type.newInstance();

CodenameOne/src/com/codename1/ui/spinner/DateSpinner.java

@@ -172,7 +172,7 @@ public void setCurrentYear(int currentYear) {
      * @return the currentDay
      */
     public int getCurrentDay() {
-        if(day.getValue() == null) {
+        if(day == null || day.getValue() == null) {
             return 1;
         }
         return ((Integer) day.getValue()).intValue();