expected_total_workload methods of scrub compaction tasks create a vector of table_info based on table names. If any table was already dropped, then the exception is thrown. It leaves table_info in corrupted state and node crashes with `free(): invalid size`.
Return std::nullopt if an exception was thrown to indicate that total workload cannot be found.
Fixes: #25941.
No release branches affected
Closesscylladb/scylladb#25944
* github.com:scylladb/scylladb:
tasks: get progress of failed task based on children
compaction: handle exception in expected_total_workload
30a3f61fa0