Update convert.py
Author: asavari381
Pull request: yes

Key Changes
Added import os: To perform file and directory operations. Path Checks and Creation: Added checks to ensure the TensorFlow checkpoint path exists and created the output directory if it does not exist. Error Handling and Logging: Included detailed error messages and logging for better user feedback. These changes will help ensure that the necessary files are present and paths are correctly managed, reducing the chance of runtime errors due to missing files or directories.

# What does this PR do?

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Fixes # (issue)


## Before submitting
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