Fix bug in ToolBaseplate when using an optional image input that is not provided

[kostrykin]

No description provided.

[github-actions]

Test coverage results for 7589e53:

• 🧩 Unit tests: 75%
• 📦 Module tests: 54%
• 🔄 Integration tests: 87%
• Total coverage: 98%

[Copilot]

Pull request overview

This PR fixes a bug in ToolBaseplate where using an optional image input (via add_input_image(key, required=False)) that is not provided would cause an error when attempting to read a None filepath. The fix filters out None filepaths before attempting to load images.

• Adds conditional filtering in parse_args() to skip loading images from None filepaths
• Updates the test CLI script to handle optional inputs by checking if they exist before accessing them
• Adds comprehensive integration test for the optional input scenario
• Bumps patch version from 0.7.1 to 0.7.2

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
giatools/cli.py	Adds if filepath is not None filter when creating input_images dictionary to prevent attempting to read from None filepaths
tests/integration/test__cli.py	Updates _threshold function to accept optional second input, modifies CLI script to conditionally use optional input, renames existing test for clarity, and adds new test case for single input scenario
giatools/version.py	Increments patch version from 1 to 2 (0.7.1 → 0.7.2)

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