Which Intent type does an empty NFC tag fall into?
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I'm having trouble matching which `Intent` filter to use for an empty NFC tag. I am able to detect tags with NDEF data. But when I tap on an empty NFC tag nothing happens.

Below is the filter part in my `AndroidManifest.xml`

    <intent-filter>
        <action android:name="android.nfc.action.NDEF_DISCOVERED"/>
        <category android:name="android.intent.category.DEFAULT"/>
        <data android:mimeType="text/plain" />
    </intent-filter>
    <intent-filter>
        <action android:name="android.nfc.action.TECH_DISCOVERED"/>
    </intent-filter>
    <intent-filter>
        <action android:name="android.nfc.action.TAG_DISCOVERED"/>
    </intent-filter>
    <meta-data android:name="android.nfc.action.TECH_DISCOVERED"
        android:resource="@xml/nfc_tech_filter" />