Added a non-null constraint to the HostDocumentSyncVersion

- Parameter of the ProvideSemanticTokensResponse class constructor.

Author: maryamariyan

src/razor/src/semantic/provideSemanticTokensResponse.ts

@@ -5,5 +5,5 @@
 
 export class ProvideSemanticTokensResponse {
     // tslint:disable-next-line: variable-name
-    constructor(public Tokens: Array<Array<number>>, public HostDocumentSyncVersion: number | null) {}
+    constructor(public Tokens: Array<Array<number>>, public HostDocumentSyncVersion: number) {}
 }

src/razor/src/semantic/semanticTokensRangeHandler.ts

@@ -18,7 +18,7 @@ export class SemanticTokensRangeHandler {
     > = new RequestType(SemanticTokensRangeHandler.getSemanticTokensRangeEndpoint);
     private emptySemanticTokensResponse: ProvideSemanticTokensResponse = new ProvideSemanticTokensResponse(
         new Array<Array<number>>(),
-        null
+        1
     );
 
     constructor(private readonly serverClient: RazorLanguageServerClient) {}