Fix: search bar allowing blank/whitespace queries (closes #196)

[Audatic07]

This PR prevents the search bar from accepting empty or whitespace-only queries.

Problem

The search form currently allows blank or whitespace inputs to be submitted, resulting in an empty results page with no feedback.
Ref: #196

Solution

Added an onsubmit function that returns false and prevents submission if the trimmed query is blank.

Testing

Verified that blank queries ("" and " ") are blocked

Verified that valid queries still submit correctly

Summary by CodeRabbit

• Chores
  • Updated theme submodule to the latest version.

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[coderabbitai]

Walkthrough

The submodule pointer for themes/northendlab-hugo has been updated from commit 1d2ddd49c5f48cdb5ba9816f877c6a907a75bcc6 to commit 3c061ce7eb345dc8f0bd92e07a8a16f9e6b90df8. No modifications to code logic, control flow, error handling, or public/exported declarations are introduced. The change consists of a single line addition and deletion, reflecting the submodule version update.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The PR title describes fixing search bar blank/whitespace queries, but the raw summary shows only a submodule pointer update with no actual code changes to implement this fix.	The title references a fix for search functionality, but the changeset only updates a theme submodule. Verify the actual changes are included or update the title to match the actual changes.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
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