Github user abhinandanprateek commented on the issue:
https://github.com/apache/cloudstack/pull/1684
@pdion891 The issue regarding dynamic apichecker will happen even without
this patch. In 4.9 there is no command.properties and it has been moved to
apichecker schema.
All this patch does is write the configuration that have 'null' values to
db. As such it is not going to reset any of the existing values during an
upgrade. cc @rhtyd @jburwell
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