BUG: READ_IF_PRESENT: return false if not read. Fixes #3193

In the original change (68c5d90a)

• processors that did not have headerOk() would still call readStream
• if no headerOk() would still return true

We assume that

• headerOk is synced amongst all processors
• readStream should be called on all processors, possibly with differing argument

Went through

• all changes in that commit
• all containers using readOptional() (read_if_present, lazy_read)

Tested a bit:

• original testcase from gitlab issue
• restarting from cumulativeContErr (uniformDimensionedField)
• restarting from GeometricField (e.g. phi)

and don't see any other problems.

If ok should be backported to master

@mark