Fix #6283 Save Member resets password

src/Umbraco.Web.UI.Client/src/views/member/member.edit.controller.js

@@ -133,7 +133,7 @@ function MemberEditController($scope, $routeParams, $location, $q, $window, appS
 
             //anytime a user is changing a member's password without the oldPassword, we are in effect resetting it so we need to set that flag here
             var passwordProp = _.find(contentEditingHelper.getAllProps($scope.content), function (e) { return e.alias === '_umb_password' });
-            if (passwordProp && passwordProp.value && !passwordProp.value.reset) {
+            if (passwordProp && passwordProp.value && (typeof passwordProp.value.reset !== 'undefined') && !passwordProp.value.reset) {
                 //so if the admin is not explicitly resetting the password, flag it for resetting if a new password is being entered
                 passwordProp.value.reset = !passwordProp.value.oldPassword && passwordProp.config.allowManuallyChangingPassword;
             }