message: Fail build if signing script is missing
diff: @@ -99,8 +99,10 @@ copy "%AIP%-SetupFiles\%AIP%.msi" "%targetsDir%\%archiveName%.msi"
  echo Building new installer with wix#
  call "BuildWixSharpInstaller.bat"
  -if EXIST c:\electron-installer\signing.bat (
  - call c:\electron-installer\signing.bat
  +if NOT EXIST c:\electron-installer\signing.bat (
  + echo Signing failed, 'signing.bat' not found.
  + exit /b -1
  )
  +call c:\electron-installer\signing.bat
  copy "WixSharpInstaller\Symphony.msi" "%targetsDir%\Experimental-%archiveName%.msi"
  