mattijs authored Nov 08, 2022 and Mark OLESEN committed Nov 25, 2022

- was previously populated with "IOobject" (the typeName) but then
  cannot easily detect if the object was actually read.
  Also clear the headerClassName on a failed read

BUG: parallel inconsistency in regIOobject::readHeaderOk

- headerOk() checked with master, but possible parallel operations
  within it