Minor cleanups

src/Tgstation.Server.Api/Models/ErrorCodeExtensions.cs

@@ -19,7 +19,7 @@ namespace Tgstation.Server.Api.Models
 			   .GetField(errorCode.ToString())
 			   ?.GetCustomAttributes(typeof(DescriptionAttribute), false);
 
-			return attributes.FirstOrDefault()?.Description;
+			return attributes?.FirstOrDefault()?.Description;
 		}
 	}
 }

src/Tgstation.Server.Host.Watchdog/Watchdog.cs

@@ -129,9 +129,9 @@ namespace Tgstation.Server.Host.Watchdog
 
 							var arguments = new List<string>
 							{
-								'"' + assemblyPath + '"',
-								'"' + updateDirectory + '"',
-								'"' + watchdogVersion + '"'
+								$"\"{assemblyPath}\"",
+								$"\"{updateDirectory}\"",
+								$"\"{watchdogVersion}\""
 							};
 
 							if (args.Any(x => x.Equals("--attach-host-debugger", StringComparison.OrdinalIgnoreCase)))