Use ArgumentNullException.ThrowIfNull helper method

Did a simple search/replace on the whole repo (except the RSSDP project)
This reduces LOC and should improve performance (methods containing a throw statement don't get inlined)

```
if \((\w+) == null\)
\s+\{
\s+throw new ArgumentNullException\((.*)\);
\s+\}
```

```
ArgumentNullException.ThrowIfNull($1);
```

1 files changed, 1 insertions, 4 deletions

diff --git a/Emby.Server.Implementations/AppBase/BaseConfigurationManager.cs b/Emby.Server.Implementations/AppBase/BaseConfigurationManager.cs
index c42cec593..26b4649dd 100644
--- a/Emby.Server.Implementations/AppBase/BaseConfigurationManager.cs
+++ b/Emby.Server.Implementations/AppBase/BaseConfigurationManager.cs
@@ -210,10 +210,7 @@ namespace Emby.Server.Implementations.AppBase
         /// <exception cref="ArgumentNullException"><c>newConfiguration</c> is <c>null</c>.</exception>
         public virtual void ReplaceConfiguration(BaseApplicationConfiguration newConfiguration)
         {
-            if (newConfiguration == null)
-            {
-                throw new ArgumentNullException(nameof(newConfiguration));
-            }
+            ArgumentNullException.ThrowIfNull(newConfiguration);
 
             ValidateCachePath(newConfiguration);