[FIX] web: new record with o2m also with new records prevent name_get

Have a model A with a o2m to B.
In the list have a field  B > m2o > C

Also have a sequence field (widget handle) on B

Then Create a record A
Arrange yourself to have two new records B popping right away (through an onchange)
in the o2m. Their C field have to be empty

Resequence those two B lines with the handle

Before this commit, there was a traceback when trying to do an name_get on the C fields
Since both of them are empty, there is no record in the localData
Hence, no model. And also no records anyway, so no need to do a name_get

After this commit, there is no traceback, the name_get is avoided when no data is to be fetched

OPW 1853088
closes #24988