fix(subscription) Coalesce lack of prefix to empty string, allow no prefix in FCDA description #1078
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Closes #1076
The code I am touching was only added recently so the reason may be nearby
I think
ldInst
is almost always part of an FCDA (GSSE being mostly dead/unused) but prefix maybe not, it is optional in Table 22 of IEC 61850-6 Ed 2.1So I don't fully understand this code path but this should get rid of the word null.