<h3 dir="auto">Problem description</h3>
<p dir="auto">If you leave a selectField as empty (i.e. value is undefined) it defaults to 0, whereas it used to show an empty selectField.</p>
<h3 dir="auto">Steps to reproduce</h3>
<p dir="auto">Create a selectField without a value prop.</p>
<h3 dir="auto">Versions</h3>
<ul dir="auto">
<li>Material-UI: 0.15.3</li>
<li>React: 15.2.1</li>
<li>Browser: Chrome 51</li>
</ul>
<h3 dir="auto">Problem description</h3>
<p dir="auto">Floating Labels (0.15.3) render like this:</p>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://cloud.githubusercontent.com/assets/1571918/17381333/404a271e-5980-11e6-8a85-fc3d53b3b1a6.png"><img width="389" alt="screen shot 2016-08-03 at 1 39 15 pm" src="https://cloud.githubusercontent.com/assets/1571918/17381333/404a271e-5980-11e6-8a85-fc3d53b3b1a6.png" style="max-width: 100%;"></a></p>
<p dir="auto">in 0.15.2 they looked like this:</p>
<p dir="auto"><a target="_blank" rel="noopener noreferrer nofollow" href="https://cloud.githubusercontent.com/assets/1571918/17381337/431daaa6-5980-11e6-91d6-fb9c8e008e9f.png"><img width="355" alt="screen shot 2016-08-03 at 1 43 08 pm" src="https://cloud.githubusercontent.com/assets/1571918/17381337/431daaa6-5980-11e6-91d6-fb9c8e008e9f.png" style="max-width: 100%;"></a></p>
### Steps to reproduce
<p dir="auto">Go to <a href="http://www.material-ui.com/#/components/select-field" rel="nofollow">http://www.material-ui.com/#/components/select-field</a> and go to the Floating Label section.</p>
<div class="highlight highlight-source-js notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="const items = [
  &lt;MenuItem key={1} value={1} primaryText=&quot;Never&quot; /&gt;,
  &lt;MenuItem key={2} value={2} primaryText=&quot;Every Night&quot; /&gt;,
  &lt;MenuItem key={3} value={3} primaryText=&quot;Weeknights&quot; /&gt;,
  &lt;MenuItem key={4} value={4} primaryText=&quot;Weekends&quot; /&gt;,
  &lt;MenuItem key={5} value={5} primaryText=&quot;Weekly&quot; /&gt;,
];

        &lt;SelectField
          value={this.state.value}
          onChange={this.handleChange}
          floatingLabelText=&quot;Floating Label Text&quot;
        &gt;
          {items}
        &lt;/SelectField&gt;"><pre class="notranslate"><span class="pl-k">const</span> <span class="pl-s1">items</span> <span class="pl-c1">=</span> <span class="pl-kos">[</span>
  <span class="pl-c1">&lt;</span><span class="pl-ent">MenuItem</span> <span class="pl-c1">key</span><span class="pl-c1">=</span><span class="pl-kos">{</span><span class="pl-c1">1</span><span class="pl-kos">}</span> <span class="pl-c1">value</span><span class="pl-c1">=</span><span class="pl-kos">{</span><span class="pl-c1">1</span><span class="pl-kos">}</span> <span class="pl-c1">primaryText</span><span class="pl-c1">=</span><span class="pl-s">"Never"</span> <span class="pl-c1">/</span><span class="pl-c1">&gt;</span><span class="pl-kos">,</span>
  <span class="pl-c1">&lt;</span><span class="pl-ent">MenuItem</span> <span class="pl-c1">key</span><span class="pl-c1">=</span><span class="pl-kos">{</span><span class="pl-c1">2</span><span class="pl-kos">}</span> <span class="pl-c1">value</span><span class="pl-c1">=</span><span class="pl-kos">{</span><span class="pl-c1">2</span><span class="pl-kos">}</span> <span class="pl-c1">primaryText</span><span class="pl-c1">=</span><span class="pl-s">"Every Night"</span> <span class="pl-c1">/</span><span class="pl-c1">&gt;</span><span class="pl-kos">,</span>
  <span class="pl-c1">&lt;</span><span class="pl-ent">MenuItem</span> <span class="pl-c1">key</span><span class="pl-c1">=</span><span class="pl-kos">{</span><span class="pl-c1">3</span><span class="pl-kos">}</span> <span class="pl-c1">value</span><span class="pl-c1">=</span><span class="pl-kos">{</span><span class="pl-c1">3</span><span class="pl-kos">}</span> <span class="pl-c1">primaryText</span><span class="pl-c1">=</span><span class="pl-s">"Weeknights"</span> <span class="pl-c1">/</span><span class="pl-c1">&gt;</span><span class="pl-kos">,</span>
  <span class="pl-c1">&lt;</span><span class="pl-ent">MenuItem</span> <span class="pl-c1">key</span><span class="pl-c1">=</span><span class="pl-kos">{</span><span class="pl-c1">4</span><span class="pl-kos">}</span> <span class="pl-c1">value</span><span class="pl-c1">=</span><span class="pl-kos">{</span><span class="pl-c1">4</span><span class="pl-kos">}</span> <span class="pl-c1">primaryText</span><span class="pl-c1">=</span><span class="pl-s">"Weekends"</span> <span class="pl-c1">/</span><span class="pl-c1">&gt;</span><span class="pl-kos">,</span>
  <span class="pl-c1">&lt;</span><span class="pl-ent">MenuItem</span> <span class="pl-c1">key</span><span class="pl-c1">=</span><span class="pl-kos">{</span><span class="pl-c1">5</span><span class="pl-kos">}</span> <span class="pl-c1">value</span><span class="pl-c1">=</span><span class="pl-kos">{</span><span class="pl-c1">5</span><span class="pl-kos">}</span> <span class="pl-c1">primaryText</span><span class="pl-c1">=</span><span class="pl-s">"Weekly"</span> <span class="pl-c1">/</span><span class="pl-c1">&gt;</span><span class="pl-kos">,</span>
<span class="pl-kos">]</span><span class="pl-kos">;</span>

        <span class="pl-c1">&lt;</span><span class="pl-ent">SelectField</span>
          <span class="pl-c1">value</span><span class="pl-c1">=</span><span class="pl-kos">{</span><span class="pl-smi">this</span><span class="pl-kos">.</span><span class="pl-c1">state</span><span class="pl-kos">.</span><span class="pl-c1">value</span><span class="pl-kos">}</span>
          <span class="pl-c1">onChange</span><span class="pl-c1">=</span><span class="pl-kos">{</span><span class="pl-smi">this</span><span class="pl-kos">.</span><span class="pl-c1">handleChange</span><span class="pl-kos">}</span>
          <span class="pl-c1">floatingLabelText</span><span class="pl-c1">=</span><span class="pl-s">"Floating Label Text"</span>
        <span class="pl-c1">&gt;</span>
          <span class="pl-kos">{</span><span class="pl-s1">items</span><span class="pl-kos">}</span>
        <span class="pl-c1">&lt;</span><span class="pl-c1">/</span><span class="pl-ent">SelectField</span><span class="pl-c1">&gt;</span></pre></div>
<h3 dir="auto">Versions</h3>
<ul dir="auto">
<li>Material-UI: 0.15.3</li>
<li>React: 15.3.0</li>
<li>Browser: Chrome</li>
</ul>