build: check errors

build/build.backend.bat

@@ -10,26 +10,31 @@ if %errorlevel% == 0 (
 call start\stop.bat nopause
 dotnet build ..\asc.web.slnf  /fl1 /flp1:logfile=asc.web.log;verbosity=normal
 echo.
+)
+
+if %errorlevel% == 0 (
 
 echo install nodejs projects dependencies...
 echo.
 
-
 for /R "scripts\" %%f in (*.bat) do (
  echo Run script %%~nxf...
  echo.
  call scripts\%%~nxf
 )
+)
 
 echo.
 
+if %errorlevel% == 0 (
 call start\start.bat nopause
+)
 
 echo.
 
 if "%1"=="nopause" goto end
 pause
 
-)
+
 
 :end