Fix Module.hasTag()

Optional<Tag> is never null, check if present instead.

Author: LeafHacker

src/main/java/clientapi/module/Module.java

@@ -326,14 +326,12 @@ public final void addTag(Tag tag) {
 
     @Override
     public final void removeTag(String id) {
-        Tag tag;
-        if ((tag = getTag(id).orElse(null)) != null)
-            tags.remove(tag);
+        getTag(id).ifPresent(tags::remove);
     }
 
     @Override
     public final boolean hasTag(String id) {
-        return getTag(id) != null;
+        return getTag(id).isPresent();
     }
 
     @Override