Show 'Not set' in details page when company has no address

[oliverjwroberts]

Description of change

This PR fixes a bug in the details tab where if a company had no address, the application would raise an error due to the page being unable to read properties of the company.address object. Now, the code checks for an address first. If a company does not have one, it displays 'Not set' under the Addresses summary table.

This fixes various recent sentry alerts:

• https://sentry.ci.uktrade.digital/organizations/dit/issues/154164/
• https://sentry.ci.uktrade.digital/organizations/dit/issues/154419/
• https://sentry.ci.uktrade.digital/organizations/dit/issues/154418/

Test instructions

The text 'Not set' displaying under the Addresses summary table on the details (formerly business details) tab.

Screenshots

Before

After

Checklist

• Has the branch been rebased to main?
• Automated tests (Any of the following when applicable: Unit, Functional or End-to-End)
• Manual compatibility testing (Browsers: Chrome, Firefox, Edge, Safari)

[cypress]

data-hub-frontend    Run #59591

Run Properties:   Passed #59591  •  da664234d3: Show 'Not set' when company has no address in addresses table on details page

Project	data-hub-frontend
Branch Review	bugfix/handle-empty-address-fields-on-details-tab
Run status	Passed #59591
Run duration	08m 04s
Commit	da664234d3: Show 'Not set' when company has no address in addresses table on details page
Committer	Oliver Roberts
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	0
Pending	4
Skipped	0
Passing	74
View all changes introduced in this branch ↗︎

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.03%. Comparing base (7071cc5) to head (da66423).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7603   +/-   ##
=======================================
  Coverage   90.03%   90.03%           
=======================================
  Files        1126     1126           
  Lines       17486    17488    +2     
  Branches     5064     5066    +2     
=======================================
+ Hits        15743    15746    +3     
+ Misses       1743     1742    -1     

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[baarkerlounger]

Nice

[DeanElliott96]

Looks good, small Q about registered address, not sure if it needs a check as well?