[OVC] Fixed error in --output_model param. #20969
Merged
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Root cause analysis:
If non-existing directory is set in --output_model, then OVC generates a model with empty name ".xml".
This happens due to error in get_model_name_from_args(), that treats non-existing as not a directory, which is wrong.
Solution:
Check not only os.path.isdir(argv.output_model), which checks that path existing directory, but also if path ends with separator which means it is non-existing output directory.
Also the logic was also corrected to not set synthetic "model.xml" name in any case. If we cannot derive original name (this can happen only if original saved model is located in root directory) and "--output_model" was not specified we should raise error.
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