First round of director mods

- Removed asserts
- The unused __DIRECTOR__ base class default constructor removed. I've used the conventional approach of having no default constructor rather than a private one (declaring it private doesn't serve any useful purpose when this constructor is not wanted).


git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@5132 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Lib/python/python.swg

@@ -473,7 +473,6 @@
 		} else {
 			$input = proxy->__get_self();
 		}
-		assert($input);
 	}
 }
 %typemap(inv) SWIGTYPE * {