remove duplicate null check (#45575)

TheAtomicOption · web-flow · commit e865fbfc1770 · 2022-12-14T13:33:45.000-08:00
diff --git a/src/Components/Components/src/PersistentComponentState.cs b/src/Components/Components/src/PersistentComponentState.cs
@@ -68,11 +68,6 @@ public PersistingComponentStateSubscription RegisterOnPersisting(Func<Task> call
             throw new ArgumentNullException(nameof(key));
         }
 
-        if (key is null)
-        {
-            throw new ArgumentNullException(nameof(key));
-        }
-
         if (!PersistingState)
         {
             throw new InvalidOperationException("Persisting state is only allowed during an OnPersisting callback.");

Original file line number	Diff line number	Diff line change
`@@ -68,11 +68,6 @@ public PersistingComponentStateSubscription RegisterOnPersisting(Func<Task> call`
`68`	`68`	`throw new ArgumentNullException(nameof(key));`
`69`	`69`	`}`
`70`	`70`
`71`		`- if (key is null)`
`72`		`- {`
`73`		`- throw new ArgumentNullException(nameof(key));`
`74`		`- }`
`75`		`-`
`76`	`71`	`if (!PersistingState)`
`77`	`72`	`{`
`78`	`73`	`throw new InvalidOperationException("Persisting state is only allowed during an OnPersisting callback.");`