Improve handling of unavailable external storages

[icewind1991]

particularly in a way the mount providers such as files_external don't need to handle it.

A non available storage should still show up in webdav/webui, give a proper exception when somebody tries to access it and show with a red background in the webui

see #22816

[PVince81]

non available storage should still show up in webdav/webui

Agreed. That was not the case in the past so it's understandable that the code might need bigger changes to accomodate for that.

@Xenopathic

[PVince81]

I saw this working with a misconfigured SMB, the storage did appear in the GUI, so it's probably solved.
@icewind1991 can you confirm ?

[PVince81]

on master / 9.1.0

[PVince81]

Closing as dupe of #11792

[lock]

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