Changes

Summary

1. fixes https://github.com/pharo-project/pharo/issues/11388 (details)
2. add guards, since now it can be called without any element (details)

Commit 326c478171dc2972bf7bb280a38150356684c983 by estebanlm fixes https://github.com/pharo-project/pharo/issues/11388
	src/Morphic-Widgets-FastTable/FTTableMorph.class.st (diff)
Commit 43b00afb0036724e77155c9368aa14967e610ebe by estebanlm add guards, since now it can be called without any element
	src/Morphic-Widgets-FastTable/FTTableContainerMorph.class.st (diff)