Fix typo in variable name

undefined local variable or method `virtio_by_path_platform'
Merge pull request #1133 from dirkmueller/syntax_error_fix

Fix typo in variable name
Fix crash on node view

In deallocated node state it is sometimes not possible
to view the node details anymore. Fixes
https://bugzilla.novell.com/show_bug.cgi?id=889834