[MWPW-166027] - Add empty space if the logo is undefined

[Deva309]

In some cases the logo is coming as undefined for the new mobile GNAV.
We have added a empty space instead of 'undefined' text showing in the new Mobile GNAV.
Error Screenshot:

Resolves: MWPW-166027

Test URLs:

• Before: https://main--milo--adobecom.aem.page/?martech=off
• After: https://mwpw-166027--milo--deva309.aem.page/?martech=off

[aem-code-sync]

	Page	Scores	Audits	Google
📱	/?martech=off
🖥️	/?martech=off

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.47%. Comparing base (a4101ed) to head (12a4f5b).

Additional details and impacted files

@@           Coverage Diff           @@
##            stage    #3528   +/-   ##
=======================================
  Coverage   96.47%   96.47%           
=======================================
  Files         260      260           
  Lines       60415    60416    +1     
=======================================
+ Hits        58284    58285    +1     
  Misses       2131     2131           

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[github-actions]

Reminder to set the Ready for Stage label - to queue this to get merged to stage & production.