No linked connection type

Resolve the errors that occur when links cannot be identified for the connection type.

The following errors can occur resulting in an export failure:

2020-07-01 13:58:34,129 - WKCConnector - ERROR - Cannot export /Changing ACEs/Not for Luke and Amy/Full Gamora/Partial Luke/Partial Amy/No Clara/I mean not clara/TinyDoc.txt as document is not on a linked connection, and was unable to be downloaded from the SD connection for copy
2020-07-01 13:58:34,129 - WKCConnector - ERROR - Failed to export /Changing ACEs/Not for Luke and Amy/Full Gamora/Partial Luke/Partial Amy/No Clara/I mean not clara/TinyDoc.txt

An exported document must either be on a linked connection, or must be available for copying to backup IBM Cloud® Object Storage in the WKC catalog, if that exists.