FENNEL: avoid range excn in TupleDescriptor::storageEqual()  (not cool to crash inside an assert() test).
FENNEL: avoid range excn in TupleDescriptor::storageEqual()
 (not cool to crash inside an assert() test).

[git-p4: depot-paths = "//open/dt/dev/": change = 3942]

LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb