This test is contrary to the spec.  In the third citation
the whole group should be suppressed because it contains
variables but none are called. See
https://github.com/citation-style-language/test-suite/issues/29

>>==== MODE ====>>
citation
<<==== MODE ====<<

>>==== RESULT ====>>
My Long Title 1 has title-short
My Long Title 2 does not have title-short
[CSL STYLE ERROR: reference with no printed form.]
<<==== RESULT ====<<

>>==== CITATION-ITEMS ====>>
[
    [
        {
            "id": "ITEM-1"
        }
    ],
    [
        {
            "id": "ITEM-2"
        }
    ],
    [
        {
            "id": "ITEM-3"
        }
    ]
]
<<==== CITATION-ITEMS ====<<

>>==== CSL ====>>
<style 
      xmlns="http://purl.org/net/xbiblio/csl"
      class="note"
      version="1.0">
  <info>
    <id />
    <title />
    <updated>2009-08-10T04:49:00+09:00</updated>
  </info>
  <citation>
    <layout>
      <choose>
        <if variable="title-short">
          <group delimiter=" ">
            <text variable="title"/>
            <group>
              <text value="has title-short"/>
            </group>
          </group>
        </if>
        <else>
          <group delimiter=" ">
            <text variable="title"/>
            <group>
              <text value="does not have title-short"/>
            </group>
          </group>
        </else>
      </choose>
    </layout>
  </citation>
</style>
<<==== CSL ====<<

>>==== INPUT ====>>
[
  {
    "id": "ITEM-1",
    "title": "My Long Title 1",
    "title-short": "My Short Title",
    "type": "book"
  },
  {
    "id": "ITEM-2",
    "title": "My Long Title 2",
    "type": "book"
  },
  {
    "id": "ITEM-3",
    "type": "book"
  }
]
<<==== INPUT ====<<



>>===== VERSION =====>>
1.0
<<===== VERSION =====<<

