In Squeak 2.8 (patch 2204) if you perform "Environment
reorganizeEverything", error-handling will stop working.  The problem is
in Error>>isDevelopmentEnvironmentPresent -- Debugger has been moved
from Smalltalk to Tools and this method can't find it anymore.

The simplest fix is just to return true from this method.  In the long run,
this should probably be changed to a preference.  A developer might
very well want to ship an image that contains the debugger, but which has
the debugger disabled.  Then if something goes wrong, the debugger can
be turned back on again.

-Lex