2384: Fix edge case bug for @setup in dry run mode

There are steps with no parent scenarios. Ex: background
Added null check.

Author: codehackerr

karate-core/src/main/java/com/intuit/karate/core/Step.java

@@ -228,7 +228,7 @@ public boolean isFake() {
     }
 
     public boolean isSetup() {
-        return scenario.isSetup();
+        return scenario !=null && scenario.isSetup();
     }
 
     @Override

karate-junit5/src/test/java/karate/setup-with-dryrun.feature

@@ -1,5 +1,8 @@
 Feature: names
 
+Background:
+    * print 'background'
+
 @setup
 Scenario: first hello world
     * def names = [{"name": "dynamic_1"}, {"name": "dynamic_2"}]