Backport/2.7/50120 (#52444)

* fixed crash in facts (#50120)

(cherry picked from commit 756ad176cc)

* added changelog

changelogs/fragments/50120-fix-vm-facts-managed-disk.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+- azure_rm_virtualmachine_facts - fixed crash related to VM with managed disk attached

lib/ansible/modules/cloud/azure/azure_rm_virtualmachine_facts.py

@@ -294,7 +294,9 @@ class AzureRMVirtualMachineFacts(AzureRMModuleBase):
         new_result['state'] = 'present'
         new_result['location'] = vm.location
         new_result['vm_size'] = result['properties']['hardwareProfile']['vmSize']
-        new_result['admin_username'] = result['properties']['osProfile']['adminUsername']
+        os_profile = result['properties'].get('osProfile')
+        if os_profile is not None:
+            new_result['admin_username'] = os_profile.get('adminUsername')
         image = result['properties']['storageProfile'].get('imageReference')
         if image is not None:
             new_result['image'] = {