Small bugfix

src/main.cc

@@ -78,6 +78,7 @@ Handle<Value> address_decode(const Arguments& args) {
 
     tools::base58::decode_addr(input, prefix, output);
     
+    if(output.length())
         output = uint64be_to_blob(prefix) + output;
 
     Buffer* buff = Buffer::New(output.data(), output.size());