288 Fix IoT Edge configuration page

[audserraCGI]

Description

What's new?

• Bug: Internal server error when trying to access to Configurations #288
• Bug: When no gateway is configured, gateway configurations report wrong metrics #275

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Tests
• Other

[codecov]

Codecov Report

Merging #289 (5c672ae) into main (7cc732a) will not change coverage.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##             main     #289   +/-   ##
=======================================
  Coverage   39.62%   39.62%           
=======================================
  Files          93       93           
  Lines        2751     2751           
=======================================
  Hits         1090     1090           
  Misses       1661     1661           

Impacted Files	Coverage Δ
.../AzureIoTHub.Portal/Server/Helpers/ConfigHelper.cs	84.21% <0.00%> (ø)
src/AzureIoTHub.Portal/Server/Startup.cs	0.00% <0.00%> (ø)
...r/Controllers/v1.0/EdgeConfigurationsController.cs	96.22% <100.00%> (ø)
...zureIoTHub.Portal/Server/Services/ConfigService.cs	100.00% <100.00%> (ø)

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