Improved error/result checking on recent dynamicweb examples
Improved error/result checking on recent dynamicweb examples

``Loader.load(...)`` will either raise an exception (if any Component raises
an exception during initialization or registration), or it will return None
if no components were found or the Component instance if all went well.

--HG--
branch : py2

treemo/circuits,treemo/circuits,nizox/circuits,treemo/circuits,eriol/circuits,eriol/circuits,eriol/circuits