fix: Add nullish fallback for tokenNetwork filter Object.keys

[gambinish]

Description

Reported crash on homepage due to Object.keys on an undefined value. I haven't been able to replciate, but here is a temporary fix while we find a more legitimate solution.

Related issues

Fixes: https://consensys.slack.com/archives/CTQAGKY5V/p1732199614277099

Manual testing steps

1. Go to homepage
2. Click around tabs, make sure app doesn't crash

Screenshots/Recordings

Before

After

Screen.Recording.2024-11-21.at.6.41.19.AM.mov

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• 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).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[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.

[metamaskbot]

Builds ready [7625322]

• 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, 6, 7
  • common: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1922 ± 63 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	1687	2178	1929	132	63
		domContentLoaded	1672	2126	1904	123	59
		load	1690	2172	1922	131	63
		domInteractive	30	105	55	24	11
		backgroundConnect	9	61	22	14	7
		firstReactRender	57	163	111	28	13
		getState	5	63	23	22	11
		initialActions	0	1	0	0	0
		loadScripts	1210	1602	1411	105	50
		setupStore	6	63	17	19	9
		uiStartup	1889	2448	2147	140	67

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: 24 Bytes (0.00%)
• common: 0 Bytes (0.00%)

[gambinish]

Closing since it looks like the bug raised was related to a weird caching issue on local. I'll reopen this if this bug resurfaces.