BIND 10 #3073: Add empty() method to Element

[BIND 10 Development]

#3073: Add empty() method to Element
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                   Reporter:  muks   |                 Owner:
                       Type:         |                Status:  new
  enhancement                        |             Milestone:  Next-Sprint-
                   Priority:         |  Proposed
  medium                             |              Keywords:
                  Component:         |             Sensitive:  0
  configuration                      |           Sub-Project:  DNS
               CVSS Scoring:         |  Estimated Difficulty:  0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Some places such as `Session::hasQueuedMsgs()` test for emptiness by
 calling `Element::size()`, which wraps around the underlying data
 structure. We should add `empty()` as a wrapper around the underlying
 `empty()` method for these cases.

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Ticket URL: <http://bind10.isc.org/ticket/3073>
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