Azure App Service step errors if no connection strings supplied and app settings are supplied

[MJRichardson]

The Deploy an Azure App Service step in will throw an error if app settings are specified, but no connection strings are.

Reported in 2021.1.7149
Reported by (private link)

Value cannot be null. (Parameter 'key')
System.ArgumentNullException
at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
at System.Collections.Generic.Dictionary`2.set_Item(TKey key, TValue value)
at Calamari.AzureAppService.Behaviors.AzureAppServiceSettingsBehaviour.PublishAppSettings(WebSiteManagementClient webAppClient, TargetSite targetSite, AppSetting[] appSettings, String authToken)
at Calamari.AzureAppService.Behaviors.AzureAppServiceSettingsBehaviour.Execute(RunningDeployment context)
at Calamari.Common.Plumbing.Pipeline.PipelineCommand.ExecuteBehaviour(RunningDeployment context, IBehaviour behaviour)
at Calamari.Common.Plumbing.Pipeline.PipelineCommand.Execute(ILifetimeScope lifetimeScope, IVariables variables)

[Octobob]

🎉 The fix for this issue has been released in:

Release stream	Release
2021.1	2021.1.7202
2021.2	2021.2.4057
2021.3+	all releases