fix null reference in PSApplicationInsightsComponent (#20709)

Author: VeryEarly

src/ApplicationInsights/custom/Models/PSApplicationInsightsComponent.cs

@@ -24,30 +24,30 @@ public class PSApplicationInsightsComponent
     {
         public PSApplicationInsightsComponent(ApplicationInsightsComponent component)
         {
-            this.ResourceGroupName = ParseResourceGroupFromId(component.Id);
-            this.Name = component.Name;
-            this.Id = component.Id;
-            this.Location = component.Location;
-            this.Tags = component.Tag.Keys.ToDictionary(x => x, x => component.Tag[x]);
-            this.Kind = component.Kind;
-            this.Type = component.Type;
-            this.AppId = component.AppId;
-            this.ApplicationId = component.ApplicationId;
-            this.ApplicationType = component.ApplicationType;
-            this.CreationDate = component.CreationDate;
-            this.FlowType = component.FlowType;
-            this.HockeyAppId = component.HockeyAppId;
-            this.HockeyAppToken = component.HockeyAppToken;
-            this.InstrumentationKey = component.InstrumentationKey;
-            this.ProvisioningState = component.ProvisioningState;
-            this.RequestSource = component.RequestSource;
-            this.SamplingPercentage = component.SamplingPercentage;
-            this.TenantId = component.TenantId;
-            this.PublicNetworkAccessForIngestion = component.PublicNetworkAccessForIngestion;
-            this.PublicNetworkAccessForQuery = component.PublicNetworkAccessForQuery;
-            this.PrivateLinkScopedResources = component.PrivateLinkScopedResource.ToList();
-            this.RetentionInDays = component.RetentionInDay;
-            this.ConnectionString = component.ConnectionString;
+            this.ResourceGroupName = ParseResourceGroupFromId(component?.Id);
+            this.Name = component?.Name;
+            this.Id = component?.Id;
+            this.Location = component?.Location;
+            this.Tags = component?.Tag?.Keys?.ToDictionary(x => x, x => component.Tag[x]);
+            this.Kind = component?.Kind;
+            this.Type = component?.Type;
+            this.AppId = component?.AppId;
+            this.ApplicationId = component?.ApplicationId;
+            this.ApplicationType = component?.ApplicationType;
+            this.CreationDate = component?.CreationDate;
+            this.FlowType = component?.FlowType;
+            this.HockeyAppId = component?.HockeyAppId;
+            this.HockeyAppToken = component?.HockeyAppToken;
+            this.InstrumentationKey = component?.InstrumentationKey;
+            this.ProvisioningState = component?.ProvisioningState;
+            this.RequestSource = component?.RequestSource;
+            this.SamplingPercentage = component?.SamplingPercentage;
+            this.TenantId = component?.TenantId;
+            this.PublicNetworkAccessForIngestion = component?.PublicNetworkAccessForIngestion;
+            this.PublicNetworkAccessForQuery = component?.PublicNetworkAccessForQuery;
+            this.PrivateLinkScopedResources = component?.PrivateLinkScopedResource?.ToList();
+            this.RetentionInDays = component?.RetentionInDay;
+            this.ConnectionString = component?.ConnectionString;
         }
 
         public string Id { get; set; }
@@ -145,7 +145,7 @@ public PSApplicationInsightsComponentWithPricingPlan(ApplicationInsightsComponen
                                                              ApplicationInsightsComponentQuotaStatus status) 
             : base(component)
         {
-            if (billing.CurrentBillingFeature.Any(f => f.Contains("Enterprise")))
+            if (billing != null && billing.CurrentBillingFeature != null && billing.CurrentBillingFeature.Any(f => f.Contains("Enterprise")))
             {
                 this.PricingPlan = "Application Insights Enterprise";
             }
@@ -154,11 +154,13 @@ public PSApplicationInsightsComponentWithPricingPlan(ApplicationInsightsComponen
                 this.PricingPlan = billing.CurrentBillingFeature.FirstOrDefault();
             }
 
-            this.Cap = billing.DataVolumeCap.Cap;
-            this.ResetTime = billing.DataVolumeCap.ResetTime;
-            this.StopSendNotificationWhenHitCap = billing.DataVolumeCap.StopSendNotificationWhenHitCap.Value;
-            this.CapExpirationTime = status.ExpirationTime;
-            this.IsCapped = status.ShouldBeThrottled != null ? status.ShouldBeThrottled.Value : false;
+            this.Cap = billing?.DataVolumeCap?.Cap;
+            this.ResetTime = billing?.DataVolumeCap?.ResetTime;
+            if (billing != null && billing.DataVolumeCap != null && billing.DataVolumeCap.StopSendNotificationWhenHitCap != null) {
+                this.StopSendNotificationWhenHitCap = billing.DataVolumeCap.StopSendNotificationWhenHitCap.Value;
+            }
+            this.CapExpirationTime = status?.ExpirationTime;
+            this.IsCapped = status?.ShouldBeThrottled != null ? status.ShouldBeThrottled.Value : false;
         }
     }
 }