Fixes: U4-3588 Value cannot be null. Parameter name: child error when using the Login Macro

src/Umbraco.Web/umbraco.presentation/umbraco/create/DLRScriptingTasks.cs

@@ -54,6 +54,7 @@ namespace umbraco
                         .SplitPascalCasing().ToFirstUpperInvariant();
 					cms.businesslogic.macro.Macro m = cms.businesslogic.macro.Macro.MakeNew(name);
 					m.ScriptingFile = fileName;
+				    m.Save();
 				}
 			}
 

src/Umbraco.Web/umbraco.presentation/umbraco/create/PartialViewMacrosTasks.cs

@@ -67,6 +67,7 @@ namespace umbraco
                     .SplitPascalCasing().ToFirstUpperInvariant();
                 var m = cms.businesslogic.macro.Macro.MakeNew(name);
                 m.ScriptingFile = BasePath + fileName;
+                m.Save();
             }
 
             _returnUrl = string.Format(EditViewFile + "?file={0}", HttpUtility.UrlEncode(ParentFolderName.EnsureEndsWith('/') + fileName));

src/Umbraco.Web/umbraco.presentation/umbraco/create/PartialViewTasks.cs

@@ -67,6 +67,7 @@ namespace umbraco
                     .SplitPascalCasing().ToFirstUpperInvariant();
                 var m = cms.businesslogic.macro.Macro.MakeNew(name);
                 m.ScriptingFile = BasePath + fileName;
+                m.Save();
             }
 
             _returnUrl = string.Format(EditViewFile + "?file={0}", HttpUtility.UrlEncode(ParentFolderName.EnsureEndsWith('/') + fileName));

src/Umbraco.Web/umbraco.presentation/umbraco/create/XsltTasks.cs

@@ -63,6 +63,7 @@ namespace umbraco
 					cms.businesslogic.macro.Macro m =
 						cms.businesslogic.macro.Macro.MakeNew(name);
 					m.Xslt = fileName + ".xslt";
+                    m.Save();
 				}
 			}