npe guard for get host info on vmware (apache#11054)

Co-authored-by: Daan Hoogland <dahn@apache.org>

Author: 2 people

vmware-base/src/main/java/com/cloud/hypervisor/vmware/mo/HostMO.java

@@ -318,6 +318,11 @@ public AboutInfo getHostAboutInfo() throws Exception {
 
     public VmwareHostType getHostType() throws Exception {
         AboutInfo aboutInfo = getHostAboutInfo();
+        if (aboutInfo == null) {
+            String msg = "no type info about host known, assuming ESXi";
+            s_logger.warn(msg);
+            return VmwareHostType.ESXi;
+        }
         if ("VMware ESXi".equals(aboutInfo.getName()))
             return VmwareHostType.ESXi;
         else if ("VMware ESX".equals(aboutInfo.getName()))