pysource batches: redirect "reg delete" error to nul

config/pysource.win.bat

@@ -21,8 +21,8 @@ set python=python-3.7.9
 endlocal & (
   set "PATH=%TELEMACDEPS%\%python%;%TELEMACDEPS%\%python%\Scripts;%PATH%"
   set "PYTHONPATH=%TELEMACDEPS%\%python%\Lib\site-packages"
-  reg delete HKCU\SOFTWARE\Classes\.py\OpenWithProgids /f 1>null
-  reg add HKCU\SOFTWARE\Classes\.py\shell\open\command /ve /f /d "%TELEMACDEPS%\%python%\python.exe \"%%1\" %%*" 1>null
+  reg delete HKCU\SOFTWARE\Classes\.py\OpenWithProgids /f >nul 2>&1
+  reg add HKCU\SOFTWARE\Classes\.py\shell\open\command /ve /f /d "%TELEMACDEPS%\%python%\python.exe \"%%1\" %%*" 1>nul
 )
 
 rem Add Mingw to PATH is it is found

config/pysource.win.debug.bat

@@ -21,8 +21,8 @@ set python=python-3.7.9
 endlocal & (
   set "PATH=%TELEMACDEPS%\%python%;%TELEMACDEPS%\%python%\Scripts;%PATH%"
   set "PYTHONPATH=%TELEMACDEPS%\%python%\Lib\site-packages"
-  reg delete HKCU\SOFTWARE\Classes\.py\OpenWithProgids /f 1>null
-  reg add HKCU\SOFTWARE\Classes\.py\shell\open\command /ve /f /d "%TELEMACDEPS%\%python%\python.exe \"%%1\" %%*" 1>null
+  reg delete HKCU\SOFTWARE\Classes\.py\OpenWithProgids /f >nul 2>&1
+  reg add HKCU\SOFTWARE\Classes\.py\shell\open\command /ve /f /d "%TELEMACDEPS%\%python%\python.exe \"%%1\" %%*" 1>nul
 )
 
 rem Add Mingw to PATH is it is found