qemu: make sure agent returns error when required data are missing
Commit 5b3492fa aimed to fix this and caught one error but exposed another one. When agent command is being executed and the thread waiting for the reply is woken up by an event (e.g. EOF in case of shutdown), the command finishes with no data (rxObject == NULL), but no error is reported, since this might be desired by the caller (e.g. suspend through agent). However, in other situations, when the data are required (e.g. getting vCPUs), we proceed to getting desired data out of the reply, but none of the virJSON*() functions works well with NULLs. I chose the way of a new parameter for qemuAgentCommand() function that specifies whether reply is required and behaves according to that. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1058149Signed-off-by: NMartin Kletzander <mkletzan@redhat.com> (cherry picked from commit 736e017e)
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