CircularBuffer: do not reset empty PublishableOutputRange #406
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When an empty PublishableOutputRange is requested, do not reset the index, offet and internal span of the buffer.
This solution was suggested by @drslebedev to fix bugs in which the buffer state would become corrupted and report negative values (casted to uint64_t) for the available number of elements, etc.
I have tested this change on the gr4-packet-modem codebase and everything seems to work correctly with the single-threaded scheduler. Things that mysteriously failed before now work. All the QA tests in gr4-packet-modem and gnuradio4 pass. There are still some things in gr4-packet-modem that don't work with the multi-threaded scheduler, but probably the problem is unrelated.