fix(vm): panic if initialization.user_account_keys contains null (#…

…1197)

Signed-off-by: Pavel Boldyrev <[email protected]>

proxmoxtf/resource/vm/vm.go

@@ -2890,7 +2890,9 @@ func vmGetCloudInitConfig(d *schema.ResourceData) *vms.CustomCloudInitConfig {
 			sshKeys := make(vms.CustomCloudInitSSHKeys, len(keys))
 
 			for i, k := range keys {
-				sshKeys[i] = k.(string)
+				if k != nil {
+					sshKeys[i] = k.(string)
+				}
 			}
 
 			initializationConfig.SSHKeys = &sshKeys