better disposing windows on restart

src/com/jpexs/decompiler/flash/gui/ErrorLogFrame.java

@@ -16,6 +16,7 @@
  */
 package com.jpexs.decompiler.flash.gui;
 
+import com.jpexs.helpers.Helper;
 import java.awt.BorderLayout;
 import java.awt.Color;
 import java.awt.Container;
@@ -318,4 +319,11 @@ public class ErrorLogFrame extends AppFrame {
         }
         log(level, msg, sw.toString());
     }
+
+    @Override
+    public void dispose() {
+        removeAll();
+        Helper.emptyObject(this);
+        super.dispose();
+    }
 }