leakix: guard parse_results against non-list JSON

[liquidsec]

When leakix.net returns an error body that decodes to a JSON string instead of a list — e.g. \"Incorrect API Key\" on an unauthenticated request — parse_results iterates over the string character-by-character and tries entry.get(\"subdomain\", \"\"), raising AttributeError: 'str' object has no attribute 'get'. The exception is caught by the outer try/except in subdomain_enum.query(), so the scan continues, but it adds traceback noise.

Sample from a real scan log:

File "/opt/bbot_dev/bbot/modules/leakix.py", line 43, in parse_results
    subdomain = entry.get("subdomain", "")
AttributeError: 'str' object has no attribute 'get'

Tightens the type check from a truthy test (if json:) to isinstance(json, list) so non-list payloads are quietly ignored.

(The same scenario triggers _api_response_is_success=False and api_request retries, so the error path is well-handled at the request layer; this is just the parse layer being defensive against malformed payloads.)

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90%. Comparing base (361c0cc) to head (97e41f2).
⚠️ Report is 29 commits behind head on dev.

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #3125   +/-   ##
=====================================
- Coverage     90%     90%   -0%     
=====================================
  Files        445     441    -4     
  Lines      38792   38743   -49     
=====================================
- Hits       34715   34663   -52     
- Misses      4077    4080    +3     

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