Confusing and redundant errors from load_cse_config()

[kyllingstad]

While implementing support for the new configuration format in CSE CLI, I tried to pass a path to a directory that does not contain any OspSystemStructure.xml file to cse_load_config(). The result was three error messages, two of which are the same:

error: :0:0 unable to open primary document entity 'C:\Users\larky\Development\osp\build-x64\cse-cli\..\..\cse-core\test\data\OspSystemStructure.xml'
error: Validation of C:\Users\larky\Development\osp\build-x64\cse-cli\..\..\cse-core\test\data\OspSystemStructure.xml failed.
error: Validation of C:\Users\larky\Development\osp\build-x64\cse-cli\..\..\cse-core\test\data\OspSystemStructure.xml failed.

I don't know where the first one comes from. The second one appears to be logged by cse-core, while the third is printed by cse-cli based on the message in an exception thrown by cse-core.

As a user of both cse-core and cse-cli, I would expect exactly one thing to happen: I get an exception/error that says "Directory 'X' does not contain OspSystemStructure.xml", or something like that.