Merge pull request #11680 from Microsoft/unnecessary_assert

Remove unnecessary assert

Author: Andy

src/server/scriptInfo.ts

@@ -87,7 +87,6 @@ namespace ts.server {
             if (this.containingProjects.length === 0) {
                 return Errors.ThrowNoProject();
             }
-            Debug.assert(this.containingProjects.length !== 0);
             return this.containingProjects[0];
         }