fix modifiers no json output file bug

--print modifiers --json modifiers.json no json output file bug

slither/printers/summary/modifier_calls.py

@@ -38,6 +38,8 @@ class Modifiers(AbstractPrinter):
                 table.add_row([function.name, [m.name for m in set(modifiers)]])
             txt += "\n" + str(table)
             self.info(txt)
+            all_txt += txt
+            all_tables.append((contract.name, table))
 
         res = self.generate_output(all_txt)
         for name, table in all_tables: