fix field with @comment and @hidden throwing npe

Author: J4C0B3Y

.idea/misc.xml

@@ -122,7 +122,7 @@ public void wipeComments(Block<?> block) {
      * @param comment The comment annotation.
      */
     protected void setComment(Block<?> block, StaticConfig.Comment comment) {
-        if (comment != null) {
+        if (block != null && comment != null) {
             setComment(block, Arrays.asList(comment.value()), comment.side());
         }
     }