[PATCH] issue #2767: Scheduled for addition files are not controlled

Hello,

I've implemented what Daniel Rall suggested in his last
comment on the issue:

        'update', on the other hand, should detect this situation
        and provide a more user-friendly error message.

The issue's current summary "Scheduled for addition files are not controlled"
is misleading so I omitted it in the log message.

[[[
Fix issue #2767

* subversion/libsvn_wc/adm_crawler.c
  (svn_wc_crawl_revisions3): Don't try to restore added but missing
  files because they have no text base. Instead, throw an error informing
  the user how to resolve the situation.

]]]

Reproduction recipe and patch attached.
I've also added a test the checks for the expected error message.

-- 
Stefan Sperling <stsp@elego.de>                 Software Developer
elego Software Solutions GmbH                            HRB 77719
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