title: "element-ui" table How to change empty cells as '-'.
body: <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>var Main = {
        data() {
          return {
            tableData: [{
              date: '2016-05-03',
              name: 'Tom',
              address: 'No. 189, Grove St, Los Angeles'
            }, {
              date: '2016-05-02',
              name: '',
              address: 'No. 189, Grove St, Los Angeles'
            }, {
              date: '2016-05-04',
              name: '',
              address: 'No. 189, Grove St, Los Angeles'
            }, {
              date: '2016-05-01',
              name: 'Tom',
              address: 'No. 189, Grove St, Los Angeles'
            }]
          }
        }
      }
  var Ctor = Vue.extend(Main)
  new Ctor().$mount('#app')</code></pre>
  <pre class="snippet-code-css lang-css prettyprint-override"><code>@import url("//unpkg.com/element-ui@2.4.11/lib/theme-chalk/index.css");</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="//unpkg.com/vue/dist/vue.js"&gt;&lt;/script&gt;
  &lt;script src="//unpkg.com/element-ui@2.4.11/lib/index.js"&gt;&lt;/script&gt;
  &lt;div id="app"&gt;
  &lt;template&gt;
      &lt;el-table :data="tableData" style="width: 100%"&gt;
        &lt;el-table-column prop="date" label="Date" width="180"&gt;
        &lt;/el-table-column&gt;
        &lt;el-table-column prop="name" label="Name" width="180"&gt;
          &lt;template slot-scope="scope"&gt;
            {{scope.row.name || '-'}}
          &lt;/template&gt;
        &lt;/el-table-column&gt;
        &lt;el-table-column prop="address" label="Address"&gt;
        &lt;/el-table-column&gt;
      &lt;/el-table&gt;
    &lt;/template&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>I know If I use 'template' tag I can convert null data as '-'.<br>
  now let's suppose that I have more than 100 tables and I don't know which cells can be null.<br> putting 'template' to all el-table-columns will be very hard work and inefficient way.<br>
  I want to know is there any way that I can change empty cells as '-' at the same time. help me guys
  <a href="https://jsfiddle.net/uwjgbosd/6/" rel="nofollow noreferrer">jsfiddle</a></p>