fix: return 400 when text param is missing in text_search

[shiwani42]

Closes #862

Problem

GET /rest/v1/text_search without a text query parameter causes an
unhandled TypeError deep in re.search() because
request.args.get('text') returns None.

Fix

Return a 400 with a descriptive error message before reaching the
database call. Also handles the empty string case (?text=).

Tests

Added two cases to test_test_search:

• missing param: 400
• empty string: 400

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yml

Review profile: CHILL

Plan: Pro

Run ID: caab2df2-d579-4142-a2a2-c11e8e2f061b

📥 Commits

Reviewing files that changed from the base of the PR and between 6f339ac and 343bd2b.

📒 Files selected for processing (2)

• application/tests/web_main_test.py
• application/web/web_main.py

Walkthrough

This PR adds input validation to the /rest/v1/text_search endpoint to handle missing or empty text query parameters. The endpoint now returns a descriptive HTTP 400 error instead of passing None to the database search function, which previously caused an unhandled TypeError.

Changes

Text Search Validation

Layer / File(s)	Summary
Text search parameter validation with tests application/web/web_main.py, application/tests/web_main_test.py	The text_search route adds an early validation guard that requires a non-empty text query parameter, returning HTTP 400 with error message {"error": "text parameter is required"} if missing or falsy. Test cases verify the endpoint returns 400 for both missing and empty text parameter scenarios.

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🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The PR title directly reflects the main change: adding validation to return 400 when the text parameter is missing in the text_search endpoint.
Description check	✅ Passed	The PR description is related to the changeset, clearly explaining the problem, fix, and tests added to address the issue.
Linked Issues check	✅ Passed	The changes fully address issue #862: the endpoint now validates the text parameter and returns 400 (instead of 500) for missing or empty text values, with appropriate test cases added.
Out of Scope Changes check	✅ Passed	All changes are scoped to addressing the text_search validation issue; no out-of-scope modifications are present in the test or implementation files.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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