fix test

scripts/ci_test.sh

@@ -41,7 +41,7 @@ test_slither(){
 
     # run slither detector on input file and save output as json
     slither "$1" --solc-disable-warnings --detect "$2" --legacy-ast --json "$DIR/tmp-test.json" 
-    if [ $? -ne 0]
+    if [ $? -ne 0 ]
     then
         echo "Slither crashed"
         exit 255

slither/utils/output.py

@@ -375,7 +375,7 @@ class Output:
                 self.add(add)
 
         if additional_fields:
-            self._data.additional_fields = additional_fields
+            self._data["additional_fields"] = additional_fields
 
     def add(self, add: SupportedOutput, additional_fields: Optional[Dict] = None):
         if not self._data["first_markdown_element"]: