Fix: adding conditional operator to prevent NullReferenceException in NugetComponentDetector (#492)

* adding conditional operator for name and version variables

* check that component name is not null

* fix: log message

---------

Co-authored-by: Daniel Akili <danielakili@microsoft.com>
Co-authored-by: Justin Perez <justinperez@microsoft.com>

src/Microsoft.ComponentDetection.Detectors/nuget/NuGetComponentDetector.cs

@@ -119,11 +119,18 @@ public class NuGetComponentDetector : FileComponentDetector
             XmlNode packageNode = doc["package"];
             XmlNode metadataNode = packageNode["metadata"];
 
-            var name = metadataNode["id"].InnerText;
-            var version = metadataNode["version"].InnerText;
-
+            var name = metadataNode["id"]?.InnerText;
+            var version = metadataNode["version"]?.InnerText;
             var authors = metadataNode["authors"]?.InnerText.Split(",").Select(author => author.Trim()).ToArray();
 
+            if (name == null)
+            {
+                this.Logger.LogInformation("Could not parse name from Nuspec {NuspecLocation}", stream.Location);
+                singleFileComponentRecorder.RegisterPackageParseFailure(stream.Location);
+
+                return;
+            }
+
             if (!NuGetVersion.TryParse(version, out var parsedVer))
             {
                 this.Logger.LogInformation("Version '{NuspecVersion}' from {NuspecLocation} could not be parsed as a NuGet version", version, stream.Location);