Revision 93f1e606 lib/cmdlib/instance.py

b/lib/cmdlib/instance.py
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    if not (self.op.nics or self.op.disks or self.op.disk_template or
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            self.op.hvparams or self.op.beparams or self.op.os_name or
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            self.op.osparams or self.op.offline is not None or
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            self.op.runtime_mem or self.op.pnode or self.op.osparams_private):
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            self.op.runtime_mem or self.op.pnode or self.op.osparams_private or
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            self.op.instance_communication is not None):
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      raise errors.OpPrereqError("No changes submitted", errors.ECODE_INVAL)
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    if self.op.hvparams:

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