fix: resolve cursor bug

Author: maher-linkdev

android/src/main/java/flutter/plugins/contactsservice/contactsservice/ContactsServicePlugin.java

@@ -287,16 +287,19 @@ public boolean onActivityResult(int requestCode, int resultCode, Intent intent)
           return true;
         }
         Uri contactUri = intent.getData();
+        Cursor cursor;
           if (intent != null){
-        Cursor cursor = contentResolver.query(contactUri, null, null, null, null);
-        if (cursor.moveToFirst()) {
+             cursor = contentResolver.query(contactUri, null, null, null, null);
+             if (cursor.moveToFirst()) {
           String id = contactUri.getLastPathSegment();
           getContacts("openDeviceContactPicker", id, false, false, false, localizedLabels, this.result);
         } else {
           Log.e(LOG_TAG, "onActivityResult - cursor.moveToFirst() returns false");
           finishWithResult(FORM_OPERATION_CANCELED);
         }}else{return true;}
-        cursor.close();
+        if (cursor != null) {
+          cursor.close();
+        }
         return true;
       }