hgweb: simplify the handling of empty repo
This abstraction have two advantages:
- If the revlog is empty, None of the code bellow is relevant,
early returns seems a win.
- Abtraction of the 'emptiness' check will help later when we stop relying on
nodefunc.
A bonus, with filtering, a non-empty revlog may not have '0' revision
accessible. It'll be easier to handle with the emptiness test in a dedicated
function
@echo off
rem Double-click this file to (re)build Mercurial for Windows in place.
rem Useful for testing and development.
cd ..\..
del /Q mercurial\*.pyd
del /Q mercurial\*.pyc
rmdir /Q /S mercurial\locale
python setup.py build_py -c -d . build_ext -i build_mo
pause