Merge pull request #669 from fee1-dead/patch-1

Fix stringer rule logic for null superclasses
(Not sure why a superclass would be null, but since it happened, I'll just merge this.)

Author: ThisTestUser

src/main/java/com/javadeobfuscator/deobfuscator/rules/stringer/RuleStringDecryptorWithThread.java

@@ -34,6 +34,9 @@ public String getDescription() {
     @Override
     public String test(Deobfuscator deobfuscator) {
         for (ClassNode classNode : deobfuscator.getClasses().values()) {
+            if (classNode.superName == null) {
+                continue;
+            }
             if (!classNode.superName.equals("java/lang/Thread")) {
                 continue;
             }