update name of deploy to deployPlatform and test for
existance of variable before testing value

Change-Id: Id40d5d779243f99b2b66c2f9d46d63e15b556ecd
diff --git a/build.gradle b/build.gradle
index 92c7c39..867e73e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -115,7 +115,7 @@
 tasks.addRule(new DockerTagRule(project))
 tasks.addRule(new GitSubmoduleUpdateRule(project))
 
-task deploy (type: Exec) {
+task deployPlatform (type: Exec) {
     dependsOn copyAnsibleInventory
 
     println "Using deployment config: $deployConfig"