Fix inventory_manage when the component for a host is not defined

Previously this would fail with a stacktrace, so now display something
useful when the component is not defined.

Change-Id: I27aa0d0b32fd1db47cc2fc43afbad085ea22d0bf

osa_toolkit/manage.py

@@ -236,6 +236,9 @@ def print_inventory(inventory, sort_key):
         else:
             row = []
             for _rl in required_list:
+                if _rl == 'component':
+                    if values.get(_rl) is None:
+                        values[_rl] = "-undefined-"
                 if _rl == 'container_name':
                     if values.get(_rl) is None:
                         values[_rl] = key