Merge pull request #2964 from Activiti/dev-almerico-fix-for-ACTIVITI-4012

fix for null pointer in example-runtime-bundle

activiti-engine/src/main/java/org/activiti/engine/impl/cmd/DeployCmd.java

@@ -82,7 +82,7 @@ public class DeployCmd<T> implements Command<Deployment>, Serializable {
                                      existingDeployment)) {
                   return existingDeployment;
               } else {
-                  deployment.setVersion(existingDeployment.getVersion() + 1);
+                  deployment.setVersion(existingDeployment.getVersion() != null? existingDeployment.getVersion() + 1 : 2);
               }
           }
     }