Merge pull request #79 from phucyall/master

[JENKINS-36952] Don't set env. variable if it's null

Author: pjdarton

src/main/java/org/jenkinsci/plugins/workflow/vSphereStep.java

@@ -122,7 +122,9 @@ protected String run() throws Exception {
                     step.getBuildStep().getClass().toString().contains("Clone") ||
                     step.getBuildStep().getClass().toString().contains("ExposeGuestInfo")) {
                 IP = step.getBuildStep().getIP();
-                envVars.put("VSPHERE_IP", IP);
+                if (IP != null) {
+                    envVars.put("VSPHERE_IP", IP);
+                }
 
                 if (step.getBuildStep().getClass().toString().contains("ExposeGuestInfo")) {
                     Map<String, String> envVars = ((ExposeGuestInfo)step.getBuildStep()).getVars();
@@ -136,4 +138,4 @@ protected String run() throws Exception {
             return IP;
         }
     }
-}
+}