A non-atomic group get (record[atomic=false]) gated each field read on
`pDbChannel && leafNode`, so fields with no dbChannel were silently
skipped. MappingInfo::Const fields carry a constant value rather than a
channel, so a non-atomic get returned them at their cloneEmpty() defaults
(0 / 0.0 / ""), while the atomic get and monitor paths return the constant.
Mirror the atomic branch's field selection in the non-atomic branch: skip
only Proc/Structure and read every other field, taking the per-field
DBLocker only when a channel is present. getGroupField() already handles
channel-less fields via field.info, so Const fields populate correctly.
Sang Woo Kim
0eebeb8d79