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NPE on afterStep because KarateBackend.getVars() seems to return a null?

See original GitHub issue

Given a basic feature file and task runner (below) I’m getting an NPE in the CucumberUtils.afterStep() due to the KarateBackend returning a null for getVars(). AFAICT this is not a misconfiguration on my part, but rather a failure of the backend. Please advise.

sanity.feature

Feature: Sanity Check
  As a developer
  I want to ensure that the test framework is active
  So that I can be confident I am testing correctly

  Background:
    * url httpBin

  Scenario: httpBin reflection
    Given path '/anything/foo/bar?baz=quux'
    When method GET
    Then status 200
    And match response contains { "args": {"baz":"quux"}}
    And match response contains { "method": "GET" }

SmokeTest.java

package apigee.feature.sanity;

import com.intuit.karate.junit4.Karate;
import cucumber.api.CucumberOptions;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.runner.RunWith;

/**
 * Created by williamspaul on 8/29/17.
 */
@RunWith(Karate.class)
@CucumberOptions(plugin = {"pretty", "html:target/cucumber"})
public class SmokeTest {

    @BeforeClass
    public static void beforeClass() {}

    @AfterClass
    public static void afterClass() {}

}

The Error

java.lang.NullPointerException
	at com.intuit.karate.cucumber.CucumberUtils.afterStep(CucumberUtils.java:148)
	at com.intuit.karate.cucumber.CucumberUtils.runStep(CucumberUtils.java:140)
	at com.intuit.karate.cucumber.KarateRuntime.runStep(KarateRuntime.java:51)
	at cucumber.runtime.model.StepContainer.runStep(StepContainer.java:44)
	at cucumber.runtime.model.StepContainer.runSteps(StepContainer.java:39)
	at cucumber.runtime.model.CucumberScenario.runBackground(CucumberScenario.java:59)
	at cucumber.runtime.model.CucumberScenario.run(CucumberScenario.java:42)
	at cucumber.runtime.junit.ExecutionUnitRunner.run(ExecutionUnitRunner.java:102)
	at cucumber.runtime.junit.FeatureRunner.runChild(FeatureRunner.java:63)
	at cucumber.runtime.junit.FeatureRunner.runChild(FeatureRunner.java:18)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at cucumber.runtime.junit.FeatureRunner.run(FeatureRunner.java:70)
	at com.intuit.karate.junit4.Karate.runChild(Karate.java:60)
	at com.intuit.karate.junit4.Karate.runChild(Karate.java:25)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at com.intuit.karate.junit4.Karate.run(Karate.java:66)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)