view hgext/__init__.py @ 14415:c238b12a1ed4

extensions: raise when trying to find an extension that failed to load

extensions that depend on other extensions (such as record) use this pattern
to check if the dependant extension is available:

    try:
        mq = extensions.find('mq')
    except KeyError:
        return

but since if an error occurs while loading an extension it leaves its entry
in the _extensions map as None, we want to raise in that situation too.

(rather than adding another check if the return value is None)

# placeholder