"cmake -E copy_directory" do not display error when directory to copy is not exists

This issue was created automatically from an original Mantis Issue. Further discussion may take place here.

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Run Command and make sure that "dupa" directory is not exists:

$ cmake -E copy_directory dupa target

Currently:

  The copy_directory command will silently ignore, that "dupa" directory is not exists. Directory "target" will be created if not exists.

Expected:

The copy_directory command should display error, that "dupa" directory is not exists. Directory "target" will be created if not exists.