fix: add extra condition to prevent erroneous calls to fetch insight

[hmalik88]

Description

Write a short description of the changes included in this pull request, also include relevant motivation and context. Have in mind the following questions:

1. What is the reason for the change? Sentry was showing undefined parameters for a signature insight call, it was found that this was reproducible when a signature request was rejected.
2. What is the improvement/solution? Added an extra condition to prevent unnecessary calls to fetchInsight in the useSignatureInsights hook.

Pre-merge author checklist

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• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
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[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.95%. Comparing base (44ecc0f) to head (05b94d2).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #26248      +/-   ##
===========================================
- Coverage    69.95%   69.95%   -0.00%     
===========================================
  Files         1411     1411              
  Lines        49963    49963              
  Branches     13800    13800              
===========================================
- Hits         34948    34947       -1     
- Misses       15015    15016       +1     

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[metamaskbot]

Builds ready [05b94d2]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (223 ± 239 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	60	595	124	121	58
		domContentLoaded	8	111	26	29	14
		load	37	1917	223	498	239
		domInteractive	8	111	26	29	14

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: 25 Bytes (0.00%)
• common: 0 Bytes (0.00%)