fix: template error while using distributed_map

Author: akshaydk

lib/deploy/stepFunctions/compileIamRole.js

@@ -314,6 +314,7 @@ function getStepFunctionsPermissions(state) {
   let stateMachineArn = state.Mode === 'DISTRIBUTED' ? {
     'Fn::Sub': [
       `arn:aws:states:\${AWS::Region}:\${AWS::AccountId}:stateMachine:${state.StateMachineName}`,
+      {},
     ],
   } : null;