Remove throw for baseline contract failure (#5301)

Author: live1206

src/AutoRest.CSharp/Common/Input/Source/SourceInputModel.cs

@@ -159,11 +159,6 @@ private bool TryGetName(ISymbol symbol, [NotNullWhen(true)] out string? name)
                 {
                     return await GeneratedCodeWorkspace.CreatePreviousContractFromDll(Path.Combine(nugetFolder, $"{Configuration.Namespace}.xml"), fullPath);
                 }
-                else
-                {
-                    throw new InvalidOperationException($"Can't find Baseline contract assembly ({Configuration.Namespace}@{baselineVersion}) from Nuget Global Package Folder at {fullPath}. " +
-                        $"Please make sure the baseline nuget package has been installed properly");
-                }
             }
             return null;
         }