Set external Id to null after backupProvider.removeVMFromBackup (apache#10562)

Author: abh1sar

plugins/backup/veeam/src/main/java/org/apache/cloudstack/backup/VeeamBackupProvider.java

@@ -191,6 +191,9 @@ public boolean assignVMToBackupOffering(final VirtualMachine vm, final BackupOff
     public boolean removeVMFromBackupOffering(final VirtualMachine vm) {
         final VeeamClient client = getClient(vm.getDataCenterId());
         final VmwareDatacenter vmwareDC = findVmwareDatacenterForVM(vm);
+        if (vm.getBackupExternalId() == null) {
+            throw new CloudRuntimeException("The VM does not have a backup job assigned.");
+        }
         try {
             if (!client.removeVMFromVeeamJob(vm.getBackupExternalId(), vm.getInstanceName(), vmwareDC.getVcenterHost())) {
                 logger.warn("Failed to remove VM from Veeam Job id: " + vm.getBackupExternalId());

server/src/main/java/org/apache/cloudstack/backup/BackupManagerImpl.java

@@ -395,10 +395,10 @@ public boolean removeVMFromBackupOffering(final Long vmId, final boolean forced)
 
         boolean result = false;
         try {
+            result = backupProvider.removeVMFromBackupOffering(vm);
             vm.setBackupOfferingId(null);
-            vm.setBackupExternalId(null);
             vm.setBackupVolumes(null);
-            result = backupProvider.removeVMFromBackupOffering(vm);
+            vm.setBackupExternalId(null);
             if (result && backupProvider.willDeleteBackupsOnOfferingRemoval()) {
                 final List<Backup> backups = backupDao.listByVmId(null, vm.getId());
                 for (final Backup backup : backups) {