[bugfix] initialize step3 image inputs for text-only requests

[mshicom]

Summary

• initialize image_inputs in Step3VLTemplate._encode() before the image branch runs
• avoid text-only Step3 requests failing when the template later updates the encoded payload

Verification

• reproduced the text-only Step3 template failure locally before the change
• verified text-only Step3 requests proceed through the template path after the fix

[gemini-code-assist]

Summary of Changes

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This pull request addresses a critical bug in the Step3VLTemplate that caused text-only requests to fail. The fix ensures robust handling of requests without images by explicitly initializing a variable that was previously only set when images were present. This change improves the stability and reliability of the template for diverse input types.

Highlights

• Bug Fix: Resolved an issue where text-only requests would fail in the Step3VLTemplate._encode() method due to an uninitialized image_inputs variable.
• Initialization: Ensured that the image_inputs dictionary is always initialized to an empty dictionary before any image-specific processing, preventing errors when no images are provided.

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[gemini-code-assist]

Code Review

This pull request initializes image_inputs as an empty dictionary in the _encode function within swift/template/templates/stepfun.py. This change ensures that image_inputs is always defined, preventing a NameError when inputs.images is empty and encoded.update(image_inputs) is called. I have no feedback to provide.

[gemini-code-assist]

This initialization of image_inputs is critical. Without it, image_inputs would be undefined if inputs.images is empty, leading to a NameError when encoded.update(image_inputs) is called later in the function. This change correctly addresses the bug for text-only requests.