bugfix: exception handling (still not correct)

tests/accept/run/tunhandledexc.nim

@@ -0,0 +1,16 @@
+type
+  ESomething = object of E_Base
+  ESomeOtherErr = object of E_Base
+
+proc genErrors(s: string) =
+  if s == "error!":
+    raise newException(ESomething, "Test")
+  else:
+    raise newException(EsomeotherErr, "bla")
+
+when True:
+  try:
+    genErrors("errssor!")
+  except ESomething:
+    echo("Error happened")
+