fix: initialize string list before conditional in BraveSearchTool

[williamhrs]

Problem

Fixes UnboundLocalError that occurs when Brave Search API returns responses without a 'web' key.

Solution

Moves string = [] initialization outside the conditional block (before line 95), ensuring the variable is always defined before being referenced on line 112.

Testing

• All existing tests pass with valid API key
• Follows standard Python practice for preventing UnboundLocalError
• No breaking changes to existing functionality

Related

This defensive fix prevents crashes on empty/malformed API responses, allowing graceful error handling.

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[!NOTE] Initialize string before the "web" in results check to ensure it's defined even when web is absent.

• BraveSearchTool (crewai_tools/tools/brave_search_tool/brave_search_tool.py):
  • Initialize string = [] before checking for results["web"] and remove duplicate init inside the block, preventing UnboundLocalError when web is missing.

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