message: Fixed detection/install of markdown-pdf
diff: @@ -107,8 +107,8 @@ if NOT EXIST c:\electron-installer\signing.bat (
  call c:\electron-installer\signing.bat
  copy "WixSharpInstaller\Symphony.msi" "%targetsDir%\Experimental-%archiveName%.msi"
  -%SystemRoot%\System32\where.exe markdown-pdf
  -if NOT ERRORLEVEL 0 (
  - npm install -g markdown-pdf
  +%SystemRoot%\System32\where.exe /q markdown-pdf
  +if ERRORLEVEL 1 (
  + call npm install -g markdown-pdf
  )
  markdown-pdf install_instructions_win.md -o "%targetsDir%\Install-Instructions-Experimental-%archiveName%.pdf"
  