After upgrade DotNetNuke to 4.6 and higher versions error occurs : Page Host > Module Definitions > Import module definition is empty.
I've found solution on DNN forums , and posted it in 'usable' version :.
So, the solution is to run SQL script with Run as Script option, in Host > SQL :
IF EXISTS (SELECT * FROM dbo.sysobjects WHERE id = object_id(N'{databaseOwner}[{objectQualifier}GetUserRoles]') AND OBJECTPROPERTY(id, N'IsPROCEDURE') = 1)
DROP PROCEDURE {databaseOwner}{objectQualifier}GetUserRoles
GO
CREATE PROCEDURE {databaseOwner}{objectQualifier}GetUserRoles
@PortalId int,
@UserId int
AS
SELECT
R.*,
UR.UserRoleID,
U.UserID,
U.DisplayName,
U.Email,
UR.EffectiveDate,
UR.ExpiryDate,
UR.IsTrialUsed
FROM {databaseOwner}{objectQualifier}UserRoles UR
INNER JOIN {databaseOwner}{objectQualifier}Users U ON UR.UserID = U.UserID
INNER JOIN {databaseOwner}{objectQualifier}Roles R ON UR.RoleID = R.RoleID
WHERE
U.UserID = @UserId AND R.PortalID = @PortalId
GO
declare @ModuleDefID int
select @ModuleDefID = ModuleDefID
from {databaseOwner}{objectQualifier}ModuleDefinitions
where FriendlyName = 'Module Definitions'
IF NOT EXISTS (SELECT ModuleControlID FROM {databaseOwner}{objectQualifier}ModuleControls WHERE ModuleDefID = @ModuleDefID AND ControlKey = N'Import')
BEGIN
insert into {databaseOwner}{objectQualifier}ModuleControls ( ModuleDefID, ControlKey, ControlTitle, ControlSrc, IconFile, ControlType, ViewOrder, HelpUrl, SupportsPartialRendering )
values ( @ModuleDefID, 'Import', 'Import Module Definition', 'Admin/ModuleDefinitions/ImportModuleDefinition.ascx', NULL, 3, NULL, NULL, 0 )
END